Journal ArticleDOI
Raman cross section of some simple gases
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In this paper, the differential Raman cross sections of the main Raman-active vibrations have been measured in the gases N2, O2, H2, CO, NO, CO2, SO2, N2O, NH3, ND3, CH4, C2H6, and C6H6 using 488.0-nm laser light.Abstract:
The differential Raman cross sections of the main Raman-active vibrations have been measured in the gases N2, O2, H2, CO, NO, CO2, SO2, N2O, H2S, NH3, ND3, CH4, C2H6, and C6H6 using 488.0-nm laser light. The present results are compared with previous measurements made at other wavelengths. The Raman cross sections of the rotational lines in the diatomic gases were also measured, as were the vibrational-rotational lines of O2 and N2. Absolute measurement of the Raman cross sections were performed two ways: (i) by calibrating the Raman spectrometer, and (ii) by comparing the unknown against liquid benzene (for which the Raman cross section has been measured). Results of these measurements compare reasonably well with previous determinations for which corrections for the υ4 frequency dependence were made.read more
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Book ChapterDOI
Raman Scattering Cross Sections in Gases and Liquids
H. W. Schrötter,H. W. Klöckner +1 more
TL;DR: In this article, the photographic technique of recording high-resolution Raman spectra of gases allows the precise measurement of wavenumber shifts and the accurate determination of molecular constants derived therefrom.
Journal ArticleDOI
The turbulent concentration field of a methane jet
TL;DR: In this article, a Raman spectrometer was used for the measurement of a methane vibrational transition function, and processed using a photon correlator to obtain the mean and fluctuating concentration levels, together with the concentration probability density distribution.
Journal ArticleDOI
Absolute rotational Raman cross sections for N2, O2, and CO2
TL;DR: In this article, the rotational Raman scattering (RRS) from N2, O2, and CO2, excited at 488.0 and 647.1 nm, is characterized by its differential cross section for backscattering, summed over Stokes and anti-Stokes bands and over scattered-light polarizations, which they find to be 1.64 × 10−29 cm2/sr ±8%.
Journal ArticleDOI
Raman pulse compression of excimer lasers for application to laser fusion
TL;DR: In this paper, the backward Raman amplifier is shown to be a promising candidate for this application and gain, saturation, and limits to amplifier performance are described, and design tradeoffs and possible techniques for further improving the performance of such amplifiers are discussed.
Journal ArticleDOI
Combustion diagnostics by laser Raman and fluorescence techniques
TL;DR: A fresh perspective and review of measurement techniques more aptly suited for the extraction of species and temperature information from combustion devices is provided.
References
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Journal ArticleDOI
Resonance Raman Effect and Resonance Fluorescence in Halogen Gases
TL;DR: In this article, the difference between the two types of spectra are discussed in some detail, and the relative scattering cross sections are given for the fundamentals and overtones of Cl2, Br2, I2, ICI, and IBr at 4880 A excitation.
Journal ArticleDOI
Gas Phase Raman Intensities: A Review of "Pre-Laser" Data
TL;DR: In this paper, Raman radiant intensities and depolarization ratios measured for gases with mercury arc irradiation and photoelectric detection have been collected, and the observed intensities have been reduced to values of the scattering activity, gj (45αj12+7γj12).
Journal ArticleDOI
Dispersion of Nitrogen
Edson R. Peck,Baij Nath Khanna +1 more
TL;DR: In this paper, the authors measured the refractivity of nitrogen gas at vacuum wavelengths from 4679 A to 20 586 A. The absolute value of refractivities for 5462 A, reduced to one atmosphere at 0°C, is 2.991×10−4.
Journal ArticleDOI
Determination of rates of change of polarizability from raman and rayleigh intensities
TL;DR: In this article, mean values of the rate of change of polarizability with respect to internuclear distance were determined for several molecules from the ratio of Raman and Rayleigh intensities in the gas.
Journal ArticleDOI
Spectral Study of NO2 Fluorescence Excited by 11 Lines of Argon and Krypton Ion Lasers
Katsumi Sakurai,H. P. Broida +1 more
TL;DR: In this article, high-resolution spectra of the fluorescence of NO2 excited by 11 Ar+ and Kr+ laser lines between 4579 and 5208 A, have been obtained at NO2 pressures from 10−3-10 torr.