Rotationally resolved vibrational overtone spectroscopy of hydrogen peroxide at chemically significant energies
- Department of Chemistry, University of Rochester, Rochester, NY 14627 (USA)
An infrared--optical double resonance scheme simplifies the room temperature 6{nu}{sub OH} vibrational overtone spectrum of hydrogen peroxide and prepares highly excited reactant molecules in single rotational states for unimolecular reaction studies. First, an optical parametric oscillator excites the OH asymmetric stretch ({nu}{sub 5}) and selects a single or small subset of rotational states. A visible dye laser pulse then promotes molecules from v{sub OH}=1 to v{sub OH}=6 where they subsequently dissociate to produce two OH fragments. A third laser detects the dissociation products {ital via} laser induced fluorescence. The rotationally resolved vibrational overtone spectra of hydrogen peroxide generated by scanning the visible dye laser frequency are assignable to a parallel band of a near prolate symmetric top. Linewidths of the individual rovibrational features range from 1--3 cm{sup {minus}1} but show no systematic dependence upon the rotational quantum numbers and are attributed predominantly to anharmonic coupling of the zeroth-order bright state to dark background states. The assignability of the double-resonance vibrational overtone spectra to {ital J} and {ital K} quantum numbers implies that {ital K} is conserved for {ital at} {ital least} a time determined by the linewidth of a single zeroth-order rovibrational feature.
- OSTI ID:
- 6256039
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Journal Issue: 12 Vol. 93:12; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Similar Records
Rotationally resolved vibrational overtone spectra of jet-cooled methanol
Broad vibrational overtone linewidths in the 7. nu. sub OH band of rotationally selected NH sub 2 OH
Related Subjects
400201* -- Chemical & Physicochemical Properties
DOUBLE RESONANCE METHODS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
HARMONICS
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFRARED RADIATION
INFRARED SPECTRA
LASER RADIATION
LINE WIDTHS
OSCILLATIONS
OXYGEN COMPOUNDS
PEROXIDES
RADIATIONS
RESOLUTION
ROTATIONAL STATES
SPECTRA
VIBRATIONAL STATES
VISIBLE RADIATION