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

Description: 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.
Date: January 1, 1993
Creator: Perry, D.S.
Partner: UNT Libraries Government Documents Department

Who's protecting you from hazardous substances

Description: Employee accidents, life endangering spills of harmful chemicals, toxic materials leaching into drinking water, polluted air, crippling side effects of wonder metals and products, and human and animal deaths made it apparent that in order to protect and preserve the community and the environment, the community needed to be aware/knowledgeable of chemical uses and related possible dangers, i.e., it was time to establish rules and regulations for the use and disposal of hazardous substances and chemicals. This report details several organizations, acts, rules, and regulations created in the interest of hazardous materials safety.
Date: January 1, 1993
Creator: Perry, D.S.
Partner: UNT Libraries Government Documents Department

Energy randomisation. How much of rotational phase space is explored? How long does it take?

Description: In applying modern theories (RRKM) of unimolecular reaction, it is necessary to decide the volume of phase space in which the energy is assumed to be randomized. The question of whether the K rotational quantum number is conserved impacts on that choice. The conceptual sequence from experimental spectra, through analysis, and interpretation in terms of K relaxation is described for ethanol and 1-butyne in the 3 micron region. The interpretation of molecular eigenstate spectra involves identification of the bright state from the coherent excitation of part of the spectrum, evaluation of the rate of energy transfer out of the bright state, deducing the mechanism of the coupling of the bright state to the bath states, and modeling the spectra in order to determine the average coupling parameters for anharmonic coupling and Coriolis interactions.
Date: December 1995
Creator: Perry, D. S.; Bethardy, G. A.; Davis, M. J. & Go, J.
Partner: UNT Libraries Government Documents Department