Stark Spectroscopy of CH3F Solvated in Helium Nanodroplets

Details Stark Spectroscopy of CH3F Solvated in Helium Nanodroplets Stark Spectroscopy of CH3F Solvated in Helium Nanodroplets

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confefb07m&link_type=abstract

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

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Matrix/Condensed Phase

Scientific paper

Infrared spectra in the 2800-3150 cm-1 region are presented for CH3F embedded in helium nanodroplets. We observe both the ν1(a1) symmetric C-H stretch and the ν4(e) asymmetric C-H stretch. Transitions from K=0(A) and K=1(E) are observed due to nuclear spin statistics. The symmetric stretch is split due to a Fermi resonance between ν1 and 2ν5 (overtone of the asymmetric bend). The (ν4,2ν5) Fermi resonance is an A1-A1 type parallel band and ν4 is a E-A1 type perpendicular transition. The upper diad of the (ν1,2ν5) Fermi resonance, found around 2960 cm-1 is homogeneously broadened due to efficient vibrational relaxation to the lower diad. Furthermore, the J=2, K=2 ← J=1, K=1 transition (rR1(1)) is significantly broadened due to rotational resonances with the phonon and roton modes of the helium droplet. Further attempts to observe broadening effects are studied by measuring the Stark Spectra of all three bands at many electric field strengths.

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