Molecular eigenstate spectroscopy: Application to the intramolecular dynamics of some polyatomic molecules in the 3000 to 7000 cm[sup [minus]1] region. [1-butyne]

Technical Report · Fri Jan 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/7069696· OSTI ID:7069696

Perry, D S

This project uses high resolution infrared spectroscopy to probe the mechanism of intramolecular vibrational redistribution (IVR) in ultracold isolated polyatomic molecules. Single resonance spectra of 1-butyne and ethanol show that qualitatively different coupling mechanisms dominate in each case anharmonic and Coriolis coupling respectively. A random matrix method for simulation of these spectra has been implemented which allows estimation of the strength of the various mechanisms at each stage of the coupling process. A new infrared double resonance (IRDR) technique employing two high resolution F-center lasers has been developed. IRDR spectra of propyne in the 2v[sub 1] region explicitly reveal a two stage coupling mechanism involving anharmonic and z-type Coriolis interactions. The data span the range between traditional high resolution spectroscopy where all line positions can be fit precisely by an explicit Hamiltonian and the domain of statistical spectroscopy.

• Research Organization: Akron Univ., OH (United States). Dept. of Chemistry
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-90ER14151
• OSTI ID: 7069696
• Report Number(s): DOE/ER/14151-3; ON: DE93010084
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
ALKYNES
CORIOLIS FORCE
COUPLING
DOCUMENT TYPES
DOUBLE RESONANCE METHODS
ENERGY LEVELS
ETHANOL
EXCITED STATES
HYDROCARBONS
HYDROXY COMPOUNDS
INFRARED SPECTRA
MICROWAVE SPECTRA
MOLECULES
ORGANIC COMPOUNDS
PROGRESS REPORT
PROPYNE
SPECTRA
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
VIBRATIONAL STATES