Browsing Abstracts of OSU International Symposium on Molecular Spectroscopy 1990-1999 by Issue Date
Now showing results 21-40 of 3912
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QUANTUM BEAT SPECTROSCOPY OF DIATOMIC TRANSIENTS
Arnold, Steven J.; Hamilton, Peter A. ( 1999 )Quantum beat spectroscopy is a method for sub-Doppler spectroscopy which provides lifetime limited linewidths and so is ideally suited to the precise measurement (typically +/- 0.1 MHz) of small splittings $(<100 MHz)$. ... -
THE ELECTRONIC SPECTRUM AND MOLECULAR STRUCTURE OF THE JET-COOLED SILICON METHYLIDYNE (SiCH) RADICAL
Smith, Tony C.; Li, Haiyang; Clouthier, Dennis J.; Kingston, C. T.; Merer, A. J. ( 1999 )Small hydrogen-containing silicon-carbon compounds are important as potential precursors to the $SiC_{n}$ clusters found in stellar atmospheres. In this work, we have observed the $\widetilde{A} {^{2}}\Sigma^{+} - \widetilde{X} ... -
THE NEAR-INFRARED SPECTRUM OF THE JET-COOLED GERMANIUM METHYLIDYNE (GeCH) RADICAL
Li, Haiyang; Smith, Tony C.; Clouthier, Dennis J.; Kingston, C. T.; Merer, A. J. ( 1999 )The $\widetilde{A} {^{2}}\Sigma^{+} - \bar{X} {^{2}}\Pi_{i}$ LIF spectrum of the previously unknown germanium methylidyne radical has been observed by fragmentation of tetramethylgermane in a pulsed discharge jet. Extensive ... -
COLOR-CENTER LASER SPECTRUM OF THIOPHENE OBSERVED WITH THE PULSED SUPERSONIC JET EXPANSION TECHNIQUE
Okumura, Akihito; Ishiguro, M.; Tanaka, Keiichi; Tanaka, Takehiko ( 1999 )The high resolution infrared spectrum of thiophene in the CH-stretch region $(3070-3140 cm^{-1})$ has been observed with a color-center laser spectrometer combined with a pulsed supersonic jet expandion technique. Of 4 ... -
MID-IR LASER SPECTROSCOPY OF $COF_{2}$ BETWEEN $1953.5 CM^{-1}$ AND $1956.0 CM^{-1}$
McCann, Patrick J.; Chao, I-Na; Namjou, Khosrow ( 1999 )This talk will describe the recent development of a user-friendly mid-IR laser spectrometer, one that does not need liquid nitrogen refills, and its use in the measurement of carbonyl fluoride $(COF_{2}). COF_{2}$ is a ... -
SUB-DOPPLER RESOLUTION LASER SPECTROSCOPY OF $CH_{4}$ AND $CH_{3}I$ WITH HIGH SENSITIVITY AND WIDE TUNABILITY IN THE $1.6 \mu m$ REGION
Ishibashi, C.; Sasada, H. ( 1999 )Recently Labachelerie and his coworkers have realized sub-Doppler resolution in vibrational overtone band spectroscopy using a Fabry-Perot cavity as an absorption $cell^{b}$. Subsequently, Hall and his colleagues have ... -
STARK SPECTROSCOPY OF $CH_{3}OD$ AND $CD_{3}OH$ USING THE DCN AND $H_{2}O$ LASERS
Jackson, M.; Sudhakaran, G. R.; Roland, N.; Mukhopadhyay, Indranath; Lees, R. M. ( 1999 )The Stark spectra of $CH_{3}OD$ and $CD_{3}OH$ have been investigated in the far-infrared region using the DCN and $H_{2}O$ lasers. The spectra were recorded at room temperature for both parallel and perpendicular polarizations ... -
HIGH PRECISION MEASUREMENT OF C-O STRETCHING BAND OF $CH_{3}OH$ USING $CO_{2}$ LASER SIDEBANDS
Sun, Z. D.; Matsushima, F.; Tsunekawa, S.; Takagi, Kojiro ( 1999 )Microwave sidebands of $CO_{2}$ laser lines have been used as an infrared power source to measure the sub-Doppler vibration-rotation frequencies of $CH_{3}OH$ in the C-O stretching band precisely. More than one hundred ... -
VIBRATIONAL ENERGY TRANSFER STUDIES IN CO-PUMPED LIQUIDS
Essenhigh, Katherine A.; Rich, J. W.; Adamovich, I. ( 1999 )New experimental results on vibrational energy transfer between diatomics in optically pumped cryogenic liquids is presented. Mixtures of carbon monoxide and nitrogen, diluted in liquid argon, are excited by the absorption ... -
CAVITY ENHANCED ABSORPTION SPECTROSCOPY OF THE $1.5 \mu m$ BAND SYSTEM OF JET COOLED AMMONIA
Berden, Giel; Peeters, Rudy; Meijer, Gerard ( 1999 )The high resolution absorption spectrum of ammonia in the $6400-6800 cm^{-1}$ region, measured at room temperature, contains about 1700 spectral features. Lundsberg-Nielsen $at al.^{a}$ have assigned 381 rotational-vibrational ... -
BRIDGING THE GAP BETWEEN VAN DER WAALS AND HYDROGEN BONDING: A NEAR-IR STUDY OF THE INTERMOLECULAR MODES IN HCl DIMER
Farnik, Michal; Davis, Scott; Nesbitt, David J. ( 1999 )The near IR combination band spectra of supersonically cooled $(HCL)_{2}$ in the $2900 cm^{-1}$ to $3070 cm^{-1}$ region have been recorded with a high resolution slit jet spectrometer. Seven vibration-rotation-tunneling ... -
THE WEAKLY-BOUND COMPLEX $CH_{4}-H_{2}$: OBSERVATION AND ANALYSIS OF INFRARED SPECTRA IN THE 350 AND $1311 cm^{-1}$ REGIONS
McKellar, A. R. W.; Roth, D. A.; Pak, I.; Winnewisser, G. ( 1999 )Infrared spectra of the weakly-bound van der Waals complex $CH_{4}-paraH_{2}$ have been observed and analyzed for the first time. Measurements were made using a long path $(160-180 m)$ low temperature $(61-92 K)$ absorption ... -
VIBRATION-ROTATION-TUNNELING-SPECTROSCOPY OF $(H_{2}O)_{4}$ AND $(H_{2}O)_{5}$: THE DRAMATIC EFFECT OF SYMMETRY ON HYDROGEN BOND TUNNELING DYNAMICS
Keutsch, F. N.; Brown, M. G.; Braly, L. B.; Petersen, P. B.; Saykally, R. J. ( 1999 )Terahertz VRT-spectra of small water clusters show splittings of the energy levels that can be explained by large amplitude vibrations and hydrogen bond rearrangement $dynamics^{a}$. For example, the cyclic water pentamer ... -
VIBRATIONAL SPECTROSCOPY AND CHEMICAL DYNAMICS IN REACTANT COMPLEXES OF HYDROXYL RADICALS WITH HYDROGEN AND $METHANE^{a}$
Lester, Marsha I. ( 1999 )The bimolecular reactions of hydroxyl radicals with hydrogen and methane play a fundamental role in the combustion of hydrocarbon fuels. This laboratory is examining the $OH + H_{2}$ and $OH + CH_{4}$ hydrogen abstraction ... -
ELECTRONIC SPECTROSCOPY OF THE $CN-H_{2}/D_{2}$ VAN DER WAALS $COMPLEX^{a}$
Chen, Yaling; Heaven, M. C. ( 1999 )A preliminary spectroscopic study of the $CN-H_{2}/D_{2}$ van der Waals complex was reported $recently^{a}$. A bound-free continuum spectrum was observed for the transition, while the system exhibited resolved rotational ... -
DISPERSED FLUORESCENCE SPECTRUM OF ${^{13}}C_{2}H_{2}$ FROM THE $\tilde{A}^{1}A_{u}$ STATE
Silva, Michelle L.; Jacobson, Matthew P.; Duan, Z.; Field, R. W. ( 1999 )The dispersed fluorescence (DF) spectrum of the $\tilde{A}^{1}A_{u} \rightarrow \tilde{X}^{1}\Sigma^{+}_{g}$ transition in ${^{13}}C_{2}H_{2}$ has been recorded utilizing the $2 \nu_{3}, \nu_{2} + \nu_{3}$, and $\nu_{2} ... -
THE SPECTROSCOPY OF THE PRODUCTS OF METASTABLE DIACETYLENE REACTIONS WITH AROMATICS
Robinson, Allison G.; Winter, Paul R.; Zwier, Timothy S. ( 1999 )Diacetylene is an important molecule in the reactions that occur in combustion processes, Accordingly, we have undertaken a systematic study of the reactions of metastable diacetylene $(C - 4H - 2^{\ast})$ with hydrocarbons ... -
SPECIATION OF PLUTONIUM IN WATER
Blaudeau, Jean-Philippe; Zygmunt, Stan A.; Curtiss, L. A.; Reed, Don T.; Bursten, Bruce E. ( 1999 )The speciation of plutonium in water was modeled using density functional theory (DFT) methods. Aqueous plutonium exists in four oxidation states: $+3, +4, +5$, and $+6$. The first two forms exist as the bare ions, but the ... -
THE CHEMICAL PROPERTIES OF EUROPIUM AND AMERICIUM
Naleway, Conrad A.; Tilson, Jeffrey L.; Seth, Michael; Shepard, Ron; Wagner, Albert F.; Brozell, Scott R.; Ermler, W. C. ( 1999 )To support on-going experimental research directed towards the separation of actinides and lanthanides from nuclear waste, theoretical studies on the molecular chemistry of representative elements from these families have ... -
EVOLUTION OF RELATIVISTIC DENSITY FUNCTIONAL METHODOLOGIES
Bursten, Bruce E.; Li, Jun; Nash, Clinton S.; Blaudeau, Jean-Philippe ( 1999 )A retrospective and current view of the use of relativistic electronic structure calculations to address the structure and bonding in molecular systems of the actinide and transactinide elements will be presented. The focus ...