Vibrational overtone spectroscopy of bound and predissociative states of hydrogen peroxide cooled in a supersonic expansion

Journal Article · Fri Aug 15 00:00:00 EDT 1986 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.451081· OSTI ID:5413786

Butler, L; Ticich, T M; Likar, M D; Crim, F F

The vibrational overtone excitation spectra of both bound and predissociative states of hydrogen peroxide molecules cooled in a supersonic expansion show features that are obscured otherwise. Spectra of p-italicr-italice-italicd-italici-italics-italics-italico-italicc-italici-italica-italict-italici-italicv-italice-italic states are measured by detecting the decomposition product following excitation of an overtone vibration. Spectra of b-italico-italicu-italicn-italicd-italic states are obtained by a two-photon excitation technique in which a second photon excites the molecule from its bound vibrational overtone state to a dissociative state. The features in the bound state (4..nu../sub OH/) spectrum are 0.08 to 0.13 cm/sup -1/ wide, reflecting small inhomogeneous broadening, but those to the predissociative state (6..nu../sub OH/) are 1.5 +- 0.3 cm/sup -1/ wide. This width, which corresponds to a lifetime of about 3.5 ps, reflects coupling into the dissociative continuum.

• Research Organization: Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
• OSTI ID: 5413786
• Journal Information: J. Chem. Phys.; (United States), Vol. 85:4
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HYDROGEN PEROXIDE
ABSORPTION SPECTRA
PREDISSOCIATION
EXCITATION
EXCITED STATES
HARMONICS
INFRARED SPECTRA
LINE WIDTHS
MOLECULAR BEAMS
MULTI-PHOTON PROCESSES
SUPERSONIC FLOW
VIBRATIONAL STATES
BEAMS
DISSOCIATION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FLUID FLOW
HYDROGEN COMPOUNDS
OSCILLATIONS
OXYGEN COMPOUNDS
PEROXIDES
SPECTRA
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory