Vibrationally highly excited acetylene as studied by dispersed fluorescence and stimulated emission pumping spectroscopy: Vibrational assignment of the feature states

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461554· OSTI ID:5132211

Yamanouchi, K; Ikeda, N; Tsuchiya, S ^[1]; Jonas, D M; Lundberg, J K; Adamson, G W; Field, R W ^[2]

---

1. Department of Pure and Applied Sciences, The University of Tokyo, Komaba, Meguroku, Tokyo (153 Japan)
2. Department of Chemistry and George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, (USA)

The dispersed fluorescence (DF) and stimulated emission pumping (SEP) spectra of acetylene originating from single rovibronic levels of the {ital {tilde A}} {sup 1}{ital A}{sub {ital u}} state were measured with resolutions of 30 and 0.5 cm{sup {minus}1}, respectively, in order to examine the vibrational level structure of the electronic ground {ital {tilde X}} {sup 1}{Sigma}{sup +}{sub {ital g}} state. The SEP spectra revealed that the number of vibrational levels under each peak in the DF spectra increases with vibrational energy from a single vibrational level below 8000 cm{sup {minus}1} to as many as ten vibrational levels above 16 500 cm{sup {minus}1}. Taking account of the fact that a peak in the DF spectrum in the high energy region is composed of more than one level, a DF peak is called a {ital feature} {ital state} (or a feature). In the DF spectra from two {ital trans}-bending levels ({ital v}{sub 3}=2 and 3) of the {ital {tilde A}} state a total of 140 DF features between 5 700 and 21 200 cm{sup {minus}1} were detected and long progressions in the {ital trans} bend ({ital v}{sup {double prime}}{sub 4}=6 --18) and CC stretch ({ital v}{sup }{sub 2}=0 --6) were identified.

• DOE Contract Number: FG02-87ER13671
• OSTI ID: 5132211
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:9; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
ALKYNES
CORIOLIS FORCE
EMISSION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUORESCENCE
HYDROCARBONS
LUMINESCENCE
MOLECULES
OPTICAL DISPERSION
OPTICAL PUMPING
ORGANIC COMPOUNDS
POLYATOMIC MOLECULES
PUMPING
RESOLUTION
RESONANCE
STIMULATED EMISSION
VIBRATIONAL STATES