FIR laser Stark spectroscopy of CH[sub 3][sup 18]OH

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Journal of Molecular Spectroscopy; (United States)

DOI:https://doi.org/10.1006/jmsp.1994.1072· OSTI ID:5008356

Jackson, M; Sudhakaran, G R; Silveira, A Jr ^[1]; Lees, R M ^[2]; Mukhopadhyay, I ^[3]

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1. State Univ. of New York, Oswego, NY (United States). Dept. of Physics
2. Univ. of New Brunswick, Fredericton (Canada)
3. Department of Atomic Energy, Indore (India). Center for Advanced Technology

The laser Stark spectrum of [sup 18]O-substituted methanol has been studied using the 337- and 311-[mu]m lines of the HCN laser as well as the 195-[mu]m line of the DCN laser. Numerous families of absorption lines have been observed for both parallel and perpendicular polarizations up to 60 kV/cm. With the 337-[mu]m line, two families of resonances are identified as J[sub K] = 9[sub 6] [l arrow] 10[sub 5]E[sub 2], v[sub t] = 0 and J[sub k] = 1[sub 1] [l arrow] 2[sub 2]E[sub 2], v[sub t] = 1 transitions. The Stark shifts for the J[sub k] = 9[sub 6] [l arrow] 10[sub 5]E[sub 2], v[sub t] = 0 transition are best represented by values of 0.893 [+-] 0.020 and 1.36 [+-] 0.02 D for the parallel and perpendicular components, respectively, of the electric dipole moment for CH[sub 3][sup 18]OH. Two families of resonances observed at [lambda] = 311 [mu]m are identified as the J[sub K] = 9[sub 1][sup [minus]] [l arrow] 8[sub 2][sup +]A, v[sub t] = 1 transition, forbidden in zero field, and the J[sub K] = 7[sub 4] [l arrow] 6[sub 3]A, v[sub t] = 0 transition. An R-branch transition observed with the 195-[mu]m line has been identified as the J[sub K] = 10[sub 7] [l arrow] 9[sub 6]A, v[sub t] = 0 transition. Zero-field frequencies for all the assigned transitions are given with improved accuracy over those calculated from available molecular constants.

• OSTI ID: 5008356
• Journal Information: Journal of Molecular Spectroscopy; (United States), Journal Name: Journal of Molecular Spectroscopy; (United States) Vol. 164:1; ISSN JMOSA3; ISSN 0022-2852
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTROSCOPY
ALCOHOLS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FAR INFRARED RADIATION
HYDROXY COMPOUNDS
INFRARED RADIATION
ISOTOPES
LASER SPECTROSCOPY
LIGHT NUCLEI
METHANOL
NUCLEI
ORGANIC COMPOUNDS
OXYGEN 18
OXYGEN ISOTOPES
RADIATIONS
SPECTROSCOPY
STABLE ISOTOPES
STARK EFFECT