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Calculation of collisionally narrowed coherent anti-Stokes Raman spectroscopy spectra

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Abstract

High-resolution coherent anti-Stokes Raman spectroscopy spectra of the N2 Q branch at 294 K have been obtained at 1, 5, and 10 atm. Even at 1-atm pressure, disagreements with spectra calculated using the isolated line approximation were observed, indicating the importance of collisional narrowing effects in describing these spectra. A method of using the full G-matrix approach for the calculation of these spectra that is both exact and computationally efficient (requiring only one matrix diagonalization and inversion per spectrum) is discussed. Excellent agreement with experimental data is obtained using this method and a simple exponential gap model for the off-diagonal G-matrix elements.

© 1985 Optical Society of America

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