Citations with the tag: INFRARED spectroscopy
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- Infrared light may help detect cancer, clots.
Lium, Alice Fussell // Design News; 11/4/96, Vol. 52 Issue 22, p42Reports on the near infrared timeresolved spectroscopy (NIR-TRS) system. Use of the system in identifying biological abnormalities such as cancers and blood clots; System's use of laser light; Researcher Kyung Kang's study of timeresolved spectroscopy.
- IR spectroscopy--it's not just for chemists.
Messenger, Heather W. // Laser Focus World; Jul96, Vol. 32 Issue 7, p5Focuses on the diversification in the applications of infrared spectroscopy, from its initial use in chemical analysis to applications in physics, engineering, and optoelectronics laboratories. Definition of the concept of spectroscopy; Maturation of Fourier-transform infrared spectrometers;...
- IR and NIR accessories.
Messenger, Heather W. // Spectroscopy; Mar2002, Vol. 17 Issue 3, p36Provides information on a catalog issued by Specac detailing accessories and consumable for infrared and near infrared spectroscopy.
- Near infrared excited micro-Raman spectra of 4:1 methanol-ethanol mixture and ruby fluorescence at..
Wang, X. B.; Shen, Z. X. // Journal of Applied Physics; 6/15/1999, Vol. 85 Issue 12, p8011Provides information on a study which examined some issues related to high-pressure micro-Raman spectroscopy using near infrared excitation source. Experimental description; Results and discussion; Conclusions.
- Infrared spectroscopic ellipsometry using a Fourier transform infrared spectrometer: Some applications in thin-film characterization.
Ferrieu, F. // Review of Scientific Instruments; Oct89, Vol. 60 Issue 10, p3212The prototype of an infrared spectroscopic ellipsometer using a Fourier transform PC-based infrared spectrometer is described. Several applications in thin-film characterization are given, particularly in the case of bulk substrate, thick-layered materials, and determination of the dielectric...
- Near-Infrared Spectroscopy as a Process Analytical Tool.
Bakeev, Katherine A. // Spectroscopy; Nov2003, Vol. 18 Issue 11, p32Part I. Discusses the application of near-infrared spectrum analysis as a process analytical tool in laboratory settings. Consideration for using long path lengths through near-infrared spectroscopy; Overview of laboratory-based spectroscopic applications; Strategies for laboratory implementation.
- Market Profile: Process Raman Spectroscopy.
Bakeev, Katherine A. // Spectroscopy; Feb2013, Vol. 28 Issue 2, p12The article presents information on the Raman spectroscopy which is considered to be a complementary technique to infrared and near infrared (NIR) spectroscopy and can detect different types of molecular vibrations and molecular bonds.
- Bright infrared beam follows changes in living human cells.
Jones-Bey, Hassaun // Laser Focus World; May2000, Vol. 36 Issue 5, p84Focuses on the infrared spectromicroscopy technique used in the observation of subtle chemical and molecular changes in individual human cells. Limitations of the traditional methods of biomedical research; Mechanism of the Synchrotron Radiation-Based Fourier Transform Infrared...
- Fourier transform, electromodulated, infrared spectrometer for studies at the electrochemical interface.
Ozanam, F.; Chazalviel, J-N. // Review of Scientific Instruments; Feb88, Vol. 59 Issue 2, p242We report on a newly built infrared spectrometer to be used for vibrational studies at the electrochemical interface. The usual way to select the weak interface absorption consists in changing the electrode potential and measuring the associated change in absorption. However, up to now it was...
- An infrared spectroscopic study of the rotation of methane in solid nitrogen.
Nelander, Bengt // Journal of Chemical Physics; 6/15/85, Vol. 82 Issue 12, p5340Infrared spectra of CH4, CH3D, and CD4 in solid nitrogen have been recorded with 0.05 cm-1 resolution at temperatures between 5.5 and 20 K. The data show that methane rotates in nitrogen. The proton spin states of CH4 interconvert very slowly at 5.5 K but rapidly at 20 K.
- Infrared spectroscopy of monolayer CH4 on NaCl(100).
Quattrocci, Laura M.; Ewing, George E. // Journal of Chemical Physics; 3/15/92, Vol. 96 Issue 6, p4205Polarized infrared spectra of CH4 adsorbed on NaCl(100) in the temperature range 4�47 K are reported. Coverage-dependent data indicate that there is only one kind of adsorption site. The adsorbate layer is also seen to grow in the form of constant density islands. A partial degeneracy breaking...
- Infrared spectroscopy of CO2�D(H)Br: Molecular structure and its reliability.
Zeng, Y. P.; Sharpe, S. W.; Shin, S. K.; Wittig, C.; Beaudet, R. A. // Journal of Chemical Physics; 10/15/92, Vol. 97 Issue 8, p5392A high resolution rovibrational absorption spectrum of the weakly bonded CO2�DBr complex has been recorded in the 2350 cm-1 region by exciting the CO2 asymmetric stretch vibration with a tunable diode laser. The CO2�DBr band origin associated with this mode is 2348.2710 cm-1, red-shifted by...
- Double modulation-high resolution infrared spectroscopic technique: The ?3 band of the CH3 radical and excited states of CH4 in a hollow cathode discharge.
Tanarro, I.; Sanz, M. M.; Bermejo, D.; Domingo, C.; Santos, J. // Journal of Chemical Physics; 1/1/94, Vol. 100 Issue 1, p238In this work several lines of the ?3 fundamental band of the CH3 radical have been detected in a refrigerated hollow cathode discharge multipass cell filled with CH4, by using a discharge and laser amplitude double modulation technique, with a difference frequency laser spectrometer and a double...
- Site specific co-adsorption at Pt(335) as probed by infrared spectroscopy: Structural alterations in the CO adlayer under aqueous electrochemical conditions.
Kim, Chung S.; Korzeniewski, Carol; Tornquist, Wade J. // Journal of Chemical Physics; 1/1/94, Vol. 100 Issue 1, p628Experiments probe the effect of hydrogen co-adsorption on the infrared spectral features of carbon monoxide adsorbed at Pt(335) {Pt(S)-[4(111)�(100)]} under aqueous electrochemical conditions. Using intermediate CO coverages, where it is possible to discern infrared spectral features for CO...
- Reinvestigation of the acetylenic C�H stretching fundamental of propyne via high resolution, optothermal infrared spectroscopy: Nonresonant perturbations to ?1.
Kerstel, E. R. Th.; Lehmann, Kevin K.; Pate, Brooks H.; Scoles, G. // Journal of Chemical Physics; 2/15/94, Vol. 100 Issue 4, p2588We present the high resolution spectrum of the ?1 fundamental of propyne near 3335 cm-1 obtained using a very warm free jet expansion in our optothermal detection spectrometer. By using a high concentration sample expanded at low backing pressures we have been able to observe transitions for K...
- Subpicosecond transient infrared spectroscopy of water: A theoretical description.
Bratos, S.; Leicknam, J-Cl. // Journal of Chemical Physics; 9/22/95, Vol. 103 Issue 12, p4887The pump�probe response of water in infrared is examined theoretically at time scales of the order of 100 fs; these times scales are characteristic of spectral diffusion. The theory is a statistical theory using correlation function description of the nonlinear optical processes involved. An...
- H[sub 2]O adsorption on BaF[sub 2](111) at ambient temperatures.
Sadtchenko, Vlad; Conrad, Peter; Ewing, George E. // Journal of Chemical Physics; 3/8/2002, Vol. 116 Issue 10, p4293Adsorption of H[sub 2]O on the BaF[sub 2](111) surface was investigated at temperatures from -1 to 25 �C using infrared spectroscopy. At coverages near a monolayer, adsorbed films have spectra that are strikingly similar to those theoretically predicted for the surface bilayer of I[sub h] ice....
- Interfacial melting of thin ice films: An infrared study.
Sadtchenko, Vlad; Ewing, George E. // Journal of Chemical Physics; 3/15/2002, Vol. 116 Issue 11, p4686Interfacial melting of ice has been examined by infrared spectroscopy for the first time. Thin ice films, from 10 to 20 nm thick, were prepared on a face of a germanium prism and studied over a range of temperatures just below the triple point. Interrogation was by attenuated total reflection...
- Effective medium theories in surface enhanced infrared spectroscopy: The pentacene example.
Ross, Daniel; Aroca, Ricardo // Journal of Chemical Physics; 11/1/2002, Vol. 117 Issue 17, p8095Effective medium theory (EMT) is a semiempirical approach developed to predict the response properties of composites. In particular, EMT has been applied to the study of rough metal surfaces that can enhance the absorption of electromagnetic radiation in the infrared [surface-enhanced infrared...
- Fiber-loop ring-down spectroscopy.
Brown, R. Stephen; Kozin, Igor; Tong, Zhaoguo; Oleschuk, Richard D.; Loock, Hans-Peter // Journal of Chemical Physics; 12/15/2002, Vol. 117 Issue 23, p10444Pulsed, visible and near-infrared laser light is coupled into an optical fiber, which is wound into a loop using a fiber splice connector. The light pulses traveling through the fiber-loop are detected using a photomultiplier detector. It is found that once the light is coupled into the fiber it...
- Broad-band fluorescence upconversion for femtosecond spectroscopy.
Schanz, R.; Kovalenko, S. A.; Kharlanov, V.; Ernsting, N. P. // Applied Physics Letters; 07/30/2001, Vol. 79 Issue 5With near-infrared gating and improved light collection geometry, the entire fluorescence band can be upconverted in a broad range of 10 000 cm-1 without readjusting optical elements, thus allowing measurements with a single pump-gate scan. Monitoring of the pump-induced white light continuum...
- Resonant and nonresonant transmission through waveguide bends in a planar photonic crystal.
Olivier, S.; Benisty, H.; Rattier, M.; Weisbuch, C.; Qiu, M.; Karlsson, A.; Smith, C. J. M.; Houdre�, R.; Oesterle, U. // Applied Physics Letters; 10/15/2001, Vol. 79 Issue 16, p2514We have measured the near-infrared transmission spectra of 60� bends defined in two-dimensional photonic crystal waveguides consisting of three missing rows. Two limit cases are studied: a basic nonresonant bend and a bend built around a resonant lozenge cavity, which is found to exhibit...
- Dynamic 2D IR spectroscopy of poly(&Vegr;-caprolactone).
Marcott, C.; Dowrey, A. E.; Story, G. M.; Noda, I. // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p77Dynamic two-dimensional infrared (2D IR) spectroscopy evolved from the analysis of orthogonal spectral data sets generated by a rheo-optical dynamic IR linear dichroism (DIRLD) measurement of polymer films undergoing a small-amplitude oscillatory deformation. DIRLD spectroscopy has provided new...
- Applications of two-dimensional correlation (2D) FT-IR spectroscopy to polymeric materials characterization.
Gregoriou, Vasilis G.; Rodman, Sheila E.; Nair, Bindu R.; Hammond, Paula T. // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p55Two applications of the technique of two-dimensional correlation (2D) analysis to problems of polymer characterization will be presented here. The first application deals with the reorientation dynamics of polymeric liquid crystals under conditions of externally applied stress. The side chain...
- Dynamic two-dimensional correlation FT-IR spectra of Bombyx mori silk fibroin.
Sonoyama, Masashi; Nakano, Tatsuhiko // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p316Recently developed dynamic step-scan FT-IR spectroscopy combined with the software-based digital signal processing was applied for infrared rheo-optical measurements of regenerated Bombyx mori silk fibroin film undergoing a sinusoidal mechanical strain. The dynamic spectra indicated that...
- 2D Vis/NIR correlation spectroscopy of cooked chicken meats.
Liu, Yongliang; Chen, Yud-Ren; Ozaki, Yukihiro // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p312Cooking of chicken meats was investigated by the generalized two-dimensional visible/near-infrared (2D Vis/NIR) correlation spectroscopy. Synchronous and asynchronous spectra in the 400�700 nm visible region suggested that the 445 and 560 nm bands be ascribed to deoxymyoglobin and...
- Near infrared spectroscopy for mastitis diagnosis: Two-dimensional correlation study in short wavelength region.
Tsenkova, Roumiana; Murayama, Koichi; Kawano, Sumio; Wu, Yuqing; Toyoda, Kiyohiko; Ozaki, Yukihiro // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p307We describe the application of two-dimensional correlation spectroscopic (2DCOS) technique for mastitic diagnosis. Seven average spectra in the short wavelength region (700�1100 nm) of mastitic levels separated from healthy to disease were subjected to 2DCOS analysis. Synchronous correlation...
- 2DIR spectroscopic studies on cholic acid.
Xu, Y-Z; Weng, S-F; Sun, W-X; Tian, W.; Yang, Z-L; Wu, J-G; Xu, G-X // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p303Based on our cryogenic FT-IR spectroscopic studies of hydrogen bonds in cholic acid, the two-dimensional FT-IR spectroscopy was applied to enhance our understanding of the hydrogen bonds. Fine spectral structures were revealed by asynchronous 2D FT-IR spectra. The co-relationship among various...
- Generalized 2D infrared spectroscopic study on protein structure of spider�s thread.
Katayama, Norihisa; Miyazawa, Mitsuhiro // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p287Structural study on spider�s thread has been performed by infrared spectroscopy. Generalized 2D method was applied for analysis of conformational transition and denaturation processes by thermal perturbation. The frequency shifts and intensity changes of amide I and amide II bands indicate...
- 2D-FTIR study of proteins.
Dzwolak, Wojciech; Kato, Minoru; Shimizu, Akio; Taniguchi, Yoshihiro // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p271Two-dimensional FTIR was applied for the examination of the H/D-exchange in D[sub 2]O-solutions of bovine a-lactalbumin. The slow spontaneous H/D-exchange at 25 �C was compared with pressure-enhanced and temperature-enhanced H/D-exchange. Although the slow room-temperature H/D-exchange and the...
- Time-resolved near IR and 2D-correlation spectroscopic studies of the polymerization process of 3-aminopropyltriethoxysilane.
Ogasawara, Toshiaki; Nara, Akishi; Okabayashi, Hirofumi; Nishio, Etsuo; O�Connor, Charmian J. // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p261The polymerization behavior of 3-aminopropyltriethoxysilane, a process initiated by water molecules, has been examined using time-resolved Near IR and 2D Near IR correlation spectra. In the time-resolved Near IR spectra, the bands at 5184 and 5300 cm-1 have been assigned to water molecules and...
- Polarized infrared spectroscopy and two-dimensional correlation spectroscopy study of molecular structure of ferroelectric liquid crystals with a naphthalene ring.
Nagasaki, Y.; Yoshihara, T.; Ozaki, Y. // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p257We have investigated molecular orientation and structure of the ferroelectric liquid crystal (FLC) with a naphthalene ring in the chiral smectic-C (SmC*) phase by using polarized infrared spectroscopy. Two-dimensional (2D) correlation spectroscopy has been applied to analyze the polarization...
- 2DIR studies on polyethylene.
Kang, N.; Xu, Y-Z; Li, W-H; Weng, S-F; Feng, W.; He, L-T; Xu, D-F; Zong, R-F; Wu, J-G; Xu, G-X // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p245We used the two-dimensional FT-IR spectroscopy cooperated with high resolution and cryogenic techniques to investigate the CH[sub 2] rocking bands (750-700 cm-1) of HDPE. The 2D asynchronous spectra showed multiple forms of orthorhombic polyethylene co-existed. For the two orthorhombic bands...
- Two-dimensional infrared correlation spectroscopy studies of polymer blends 1: Chain conformation and bonding in atactic polystyrene-poly(2,6-dimethyl-1,4-phenylene ether) blends.
Nishioka, Toshikatsu; Ren, Yanzhi; Tsubahara, Nobutaka; Nakashima, Kenichi; Noda, Isao; Ozaki, Yukihiro // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p241� 2000 American Institute of Physics.
- Two-dimensional correlation analysis of variable-temperature Fourier-transform near-infrared spectra of an amorphous polyamide.
Wu, Peiyi; Siesler, Heinz W. // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p18Near-infrared (NIR) spectra of a totally amorphous polyamide measured over the temperature range from 25 �C-200 �C were analyzed using generalized two-dimensional (2D) correlation spectroscopy. At least five distinct bands at 5690, 5810, 5900, 5980 and 6010 cm-1 were identified in the region...
- Two-dimensional infrared femtosecond spectroscopy of cyclic pentapeptides.
Piryatinski, Andrei; Chernyak, Vladimir; Mukamel, Shaul // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p117The multidimensional optical response of the amide I band of the pentapeptide (cyclo(D-Abu-Arg-Gly-Asp-Mamb)) is computed using the vibrational-exciton model, treating each peptide unit as a localized anharmonic vibration. The absolute value, the real and the imaginary parts of the 2D photon...
- 2D-IR study of the aggregation of lipid-bound cytochrome c.
Paquet, Marie-Jose�e; Auger, Miche`le; Pe�zolet, Michel // AIP Conference Proceedings; 2000, Vol. 503 Issue 1, p103The aggregation of cytochrome c has been studied by 1D and 2D-IR spectroscopy in the presence of dimyristoylphosphatidylglycerol (DMPG). The influence of temperature on the aggregation has been evaluated by monitoring the intensity of a band at 1616 cm-1, which is characteristic of aggregated...
- Measurement of high boron concentrations in silicon by infrared spectroscopy.
Sopori, B. L. // Applied Physics Letters; 7/1/85, Vol. 47 Issue 1, p39A new absorption line corresponding to an electronic transition P3/2?P1/2 at 668 cm-1 is used to measure high concentrations of boron in silicon. The calibration constant at 12 K is determined from the measurements on single-crystal silicon. A linear relationship between the absorbance and boron...
- Resolved structure in the quenching band of the EL2 center in GaAs, studied by infrared spectroscopy.
Fuchs, F.; Dischler, B. // Applied Physics Letters; 12/21/87, Vol. 51 Issue 25, p2115Infrared measurements at low temperature on undoped semi-insulating GaAs reveal additional details in the photoresponse of the EL2 center. In the continuous spectral recording of the optical cross section for the bleaching of the EL2 absorption the zero phonon line (ZPL) at 1.039 eV and six...
- A Monolithic Interferometer for FT-IR Spectroscopy.
Bleier, Zvi; Brouillette, Carl; Carangelo, Robert // Spectroscopy; Oct1999, Vol. 14 Issue 10, p46Describes a Michelson monolithic interferometer for Fourier transformation-infrared spectroscopy. Components of a Michelson interferometer; Discussion on how wavefront accuracy and alignment affect stability; Applications.
- Using Polarized Vibrational Spectroscopy to Characterize Molecular Orientation in Polymers.
Everall, Neil // Spectroscopy; Sep2000, Vol. 15 Issue 9, p38Discusses the physical principles and mathematical manipulations required in polarized infrared spectroscopy to compute orientation parameters. Concept of molecular orientation; Measurement of orientation with polarized infrared spectroscopy; Analysis of orientation using Raman spectroscopy.
- The Birth of Infrared Filtometry.
Wilks, Paul A. // Spectroscopy; Mar2002, Vol. 17 Issue 3, p14Editorial. Presents an article about the discovery of infrared (IR) filtometers, an instrument used in spectroscopy. Benefits from IR filtometers; Characteristics of IR filtometers; Applications of IR filtometers.
- Spectroscopic investigation of the thermal stability of bound hydrogen in a-C : H.
Ivanov-Omskii, V. I.; Frolova, G. S.; Yastrebov, S. G. // Technical Physics Letters; Apr97, Vol. 23 Issue 4, p251Equilibrium between free and bound hydrogen in amorphous hydrogenated carbon has been investigated by infrared spectroscopy. A quasireversible departure of hydrogen from the bound state is observed. The activation energy of the bound-quasifree hydrogen chemical reaction and the rate of return of...
- Investigation of the structure of thin layers of hexadecane on a metal substrate by infrared spectroscopy.
Vettegren�, V. I.; Tupitsyna, A. I. // Technical Physics Letters; May98, Vol. 24 Issue 5, p381Infrared spectroscopy was used to analyze the structure of 0.5-10 �m thick layers of hexadecane on a metal substrate in the range 3000-2800 cm[sup -1]. The results suggest that density fluctuations occur in layers between 3 and 10 �m thick, whereas the hexadecane crystallizes in thinner layers.
- Infrared spectroscopic markers of conformational defects in polymethylene chain molecules.
Jona, P.; Gussoni, M.; Zerbi, G. // Journal of Applied Physics; 2/1/85, Vol. 57 Issue 3, p834Presents a study which calculated infrared absorption bands which can be related to conformational defects in long polymethylene chains. Characterization of the defect structure in polymeric materials in the solid state; Comparativity of defect modes; Discussion of dynamics and spectroscopy.
- A far infrared laser sideband spectrometer in the frequency region 550�2700 GHz.
Verhoeve, P.; Zwart, E.; Versluis, M.; Drabbels, M.; ter Meulen, J. J.; Meerts, W. Leo; Dymanus, A.; McLay, D. B. // Review of Scientific Instruments; Jun90, Vol. 61 Issue 6, p1612This paper describes a tunable far-infrared (FIR) spectrometer. Tunable radiation is obtained by frequency mixing, fixed frequency FIR laser radiation and tunable microwave radiation in Schottky barrier diodes. An optically pumped laser and an HCN discharge laser are used as FIR sources and...
- A diamond anvil cell for IR microspectroscopy.
Chervin, J.C.; Canny, B.; Besson, J.M.; Pruzan, Ph. // Review of Scientific Instruments; Mar95, Vol. 66 Issue 3, p2595Describes an optical-aperture membrane diamond anvil cell designed for infrared spectroscopy. Comparison of the advantages offered by the cell with existing systems; Citation of other possibilities concerning x-ray diffraction analyses with the cells.
- Decay dynamics of the vibrationally activated OH�CO reactant complex.
Pond, Bethany V.; Lester, Marsha I. // Journal of Chemical Physics; 2/1/2003, Vol. 118 Issue 5, p2223The decay dynamics of the OH-CO reactant complex have been examined following infrared excitation in the OH overtone region using various IR pump-UV probe methods. The time scale for overall decay of the OH-CO (2 υ [SUBOH]) complex has been bracketed between 0.19 and 5 ns through linewidth...
- A new approach to the study of interfacial melting of ice:infrared spectroscopy.
Sadtchenko, Vlad; Ewing, George E. // Canadian Journal of Physics; Jan2003, Vol. 81 Issue 1/2, p333Faraday observed in 1850 "that a particle of water which could retain the liquid state whilst touching ice on only one side, could not retain the liquid if it were touched by ice on both" (M. Faraday, Royal Institution Discourse, June 7, 1850; Experimental Researches in Chemistry and Physics...
- Sub-Doppler resolution infrared spectroscopy of water dimer.
Huang, Z. S.; Miller, R. E. // Journal of Chemical Physics; 6/15/88, Vol. 88 Issue 12, p8008Reports on the observation of the first rotationally resolved infrared spectrum for water dimer. Methodology; Results and discussion.
