High Resolution Studies of the νb{3} Band of Methyl Fluoride in Solid Parahydrogen Using a Quantum Cascade Laser

Details High Resolution Studies of the νb{3} Band of Methyl Fluoride in Solid Parahydrogen Using a Quantum Cascade Laser High Resolution Studies of the νb{3} Band of Methyl Fluoride in Solid Parahydrogen Using a Quantum Cascade Laser

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confefb05m&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Physics

Matrix/Condensed Phase

Scientific paper

The νb{3} band of CH_3F isolated in solid para-H_2 exhibits a clearly resolved series of lines due to clusters of CH_3F with residual ortho-H_2 molecules, CH_3F-(ortho-H_2)_N, with N = 0 ˜ 12. We have examined this spectrum in detail using a quantum cascade laser source. Solid hydrogen crystals were formed by direct vapor phase deposition on a BaF_2 window at 2 K followed by annealing (4.6 K for 10 minutes) or "super-annealing" (7 K for 10 seconds). The cw laser (Hamamatsu Corp.) was a room temperature DFB device with output powers up to 30 mW and a tuning range of about 1042 - 1036 wn for device temperatures of 0 - 37° C. This power level was easily strong enough to modify the sample by means of spectral hole-burning effects. It was therefore necessary to strongly attenuate the laser in order to record normal ``static" spectra. But we also took advantage of the power to make interesting ``dynamic" measurements in which a transition could be bleached away and forced to reappear in a new position. Line widths as narrow as 0.0065 wn were observed and line profiles were Lorentzian. The N = 0 line at 1040.19 wn was resolved into two closely-spaced (˜0.008 wn) components which we believe correspond to the K = 0 (A) and 1 (E) levels of CH_3F, arising from partially free a-axis rotation in the crystal. Numerous extra satellite lines were observed around each main feature (N = 0, 1, 2, 3, 4) as well as some weak but sharp transitions almost mid-way between N = 0 and 1.
K. Yoshioka and D.T. Anderson, J. Chem. Phys. 119, 4731 (2003).
Y.-P. Lee, Y.-J. Wu, and J.T. Hougen, J. Chem. Phys. 129, 104502 (2008).

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