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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 2, Iss. 4 — Apr. 1, 1985
  • pp: 640–648

Time-domain coherent active Raman spectroscopy of a free-nitrogen jet

S. A. Akhmanov, N. I. Koroteev, S. A. Magnitskii, V. B. Morozov, A. P. Tarasevich, and V. G. Tunkin  »View Author Affiliations

JOSA B, Vol. 2, Issue 4, pp. 640-648 (1985)

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A review of our results in time-domain coherent anti-Stokes Raman spectroscopy (CARS) of N2 molecules cooled in a supersonic jet is given. A full quantitative interpretation of the detected quantum beats, which makes it possible to determine the Trot of N2, is proposed. A noticeable increase of the dephasing cross section with the lowering of temperature is detected. The sensitivity of the CARS spectrometer was radically improved by the development of the injection-locked optical parametric oscillator, which made it possible to register the cooling of N2 to temperatures as low as 8 K.

© 1985 Optical Society of America

Original Manuscript: October 26, 1984
Manuscript Accepted: November 13, 1984
Published: April 1, 1985

S. A. Akhmanov, N. I. Koroteev, S. A. Magnitskii, V. B. Morozov, A. P. Tarasevich, and V. G. Tunkin, "Time-domain coherent active Raman spectroscopy of a free-nitrogen jet," J. Opt. Soc. Am. B 2, 640-648 (1985)

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  15. We can, of course, neglect time-of-flight effects. Indeed, the maximum speed of the stream is less than 1 μm/nsec, while the diameter of the excited volume is about 100 μm. (In our case it is the dimensions of the excited volume that are of importance rather than those of the probed volume, which was 20 μm in diameter.) The absence of mean decay in Fig. 6 and Figs. 7A, 7C, and 7D proves directly that we do not have to take the time-of-flight effects into account and that our delay line is aligned well (see also the dephasing curve of H2 in Fig. 2).
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  21. n is not so sensitive to condensation as T. See, for example, Ref. 16 or Ref.17.
  22. πσdeph2 values are obtained with more accuracy than in Ref. 10, where πσdeph2 was calculated with T of isentropic expansion in spite of Trot (see the difference between T and Trot in Fig. 8).
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  24. A. N. Brodnikovsky, S. M. Gladkov, N. I. Koroteev, “Strong selective excitation of Raman active vibrations and energy transfer between low-lying vibrational states of a CO2 molecule studied by CARS and PARS,” Opt. Commun. 40, 312–314 (1982). [CrossRef]

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