Browsing Abstracts of OSU International Symposium on Molecular Spectroscopy 1990-1999 by Title
Now showing results 662-681 of 3912
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E. BRIGHT WILSON REMEMBERANCE
Wilson, Kenneth ( 1993 ) -
$E^{1}\Sigma_{g}^{+}\cdot F^{1}\Sigma_{g}^{+}$ ENERGY LEVELS CROSSING AND LONG RANGE WINDOWS IN $Li_{2}$
Antonova, Stiliana; Lazarov, Guenadiy; Wang, X.; Qi, Jianbing; Lyyra, A. M.; Linton, C. ( 1998 )The potential energy curves of both the $E(3)^{1}\Sigma_{g}^{+}$ and $F(4)^{1}\Sigma_{g}^{+}$ states of $Li_{2}$ exhibit shelf regions at large internuclear distances and are in the same energy region. For these states the ... -
EFFECT OF CLUSTERING ON ELECTRONIC RADIATIONLESS DECAY: THE SUPPRESSION OF ``CHANNEL THREE'' IN BENZENE COMPLEXES
Hahn, M. Y.; Cheng, P. Y.; Ju, S. S.; Dai, H. L. ( 1991 )``Channel Three” refers to the intramolecular mechanism responsible for the sudden and anomalous fluorescence quenching at about $3,000 cm^{-1} $ above the origin of the benzene $S_{1} $ state. Previous $studies^{1}$ found ... -
THE EFFECT OF EXTERNAL PRESSURE ON THE HIGH SPIN TO LOW SPIN TUNNELING RATE OF A Fe(II) SPIN CROSSOVER SYSTEM
Wang, W.; Chan, I. Y. ( 1996 )For a class of Fe(II) coordination compounds, the spin state is temperature $dependent^{2}$. A compound that is in the high spin state (HS) above a thermal transition temperature may cross over to the low spin state (LS) ... -
THE EFFECT OF REDUCED MASS ON CROSSED BEAM ROVIBRATIONAL ENERGY TRANSFER FROM $S_{1}$ GLYOXAL ($0^{0}, K' = 0$)
Clegg, Samuel M.; Parmenter, C. S.; Lu, S.- P. ( 1996 )Energy transfer from $S_{1}$ glyoxal (CHO-CHO) in collision with additional target gases is now added to a list of collision partners ($H_{2}$, $D_{2}$, $He_{2}$, $Kr_{3}$ and $C_{5}H_{2}$) previously presented. A laser ... -
EFFECT OF STEPWISE METHYL SUBSTITUTION OF PHENOLIC HYDROGEN ON IVR DYNAMICS IN HYDROQUINONE
Patwari, G. Naresh; Doraiswamy, S.; Wategaonkar, S. ( 1998 )The vibronic spectroscopy and IVR dynamics in the $S_{1}$ state of jet-cooled hydroquinone, p-methoxyphenol, and p-dimethoxybenzene have been studied using laser induced fluorescence technique. The objective was to study ... -
EFFECT OF STRUCTURE AND CONFORMATION OF RAMAN TRACE SCATTERING INTENSITIES IN HYDROCARBONS
Gough, K. M.; Dwyer, Jason R.; Gawlik, Ted ( 1998 )The ab initio $(HF/D95^{\ast \ast})$ optimized geometries and equilibrium molecular polarizabilities have been obtained for thirty-five hydrocarbons: all-trans straight chain alkanes to $C_{15}$, as well as $C_{25}$, ... -
EFFECTIVE MOMENTS OF INERTIA OF LINEAR MOLECULES EMBEDDED IN ${^{4}}He$ CLUSTERS.
Callegari, C.; Conjusteau, Andre; Reinhard, I.; Lehmann, K. K.; Scoles, G.; Dalfovo, Frankco ( 1999 )In recent times, rotationally resolved infrared spectra of several linear molecules $(HCN^{a}, HCCH^{b}, OCS^{c}, HCCCN^{d})$ embedded in ${^{4}}He$ clusters have been measured by us and by other groups. From such spectra, ... -
EFFECTIVE ROTATION AND FINE-STRUCTURE HAMILTONIANS OF SYMMETRIC TOP MOLECULES IN DEGENERATE VIBRONIC STATES
Liu, Xianming; Miller, Terry A. ( 1990 )Effective Hamiltonians, both first and second order, for rotation, spin-rotation and electron dipolar spin-spin interactions of a symmetric top molecule in a doubly degenerate vibronic state have been obtained group ... -
EFFECTIVE ROTATION-PSEUDOROTATION HAMILTONIAN FOR $X_{3}$-TYPE MOLECULES IN THE HIGH-BARRIER LIMIT
Ohashi, N.; Hougen, Jon T. ( 1995 )The rotation-pseudorotation problem in $X_{3}$-type molecules has been treated group-theoretically for the high-barrier tunneling case. Explicit expressions for rotation-pseudorotation Hamiltonian matrix elements, which ... -
EFFECTIVE ROTATIONAL HAMILTONIAN IN TUNNELING SYSTEMS
Groner, P. ( 1993 )The effective rotational Hamiltonian of molecules with two periodic large-amplitude motions were derived in terms of effective tunneling parameters similarly to the procedure described for one-dimensional problems. The ... -
EFFECTS OF A CORE ELECTRIC DIPOLE MOMENT ON RYDBERG STATES
Watson, J. K. G. ( 1993 )Recently, Harris and $Jungen^{1}$ have shown that the dipolar core of the CaF molecule has an important effect on its Rydberg $states^{2}$. Here the hydrogen atom with an electric dipolar core is treated as a simple model ... -
THE EFFECTS OF A HELIUM NANO-DROPLET MATRIX ON THE ELECTRONIC SPECTROSCOPY OF SODIUM DIMERS.
Higgins, J.; Callegari, C.; Reho, J.; Scoles, G.; Ernst, Wolfgang E. ( 1997 )Large liquid helium clusters consisting of several thousand helium atoms are used as a cold matrix (0.4 K) for the formation of sodium dimers in their singlet and triplet states by the successive pick-up of single sodium ... -
THE EFFECTS OF SPIN-ORBIT COUPLING ON THE SPECTROSCOPY OF JAHN-TELLER ACTIVE MOLECULES
Barckholtz, Timothy A.; Miller, Terry A. ( 1997 )We have developed a program that incorporates spin-orbit coupling directly into the normal Jahn-Teller Hamiltonian. The effects of spin-orbit coupling on the electronic spectroscopy of Jahn-Teller active molecules will be ... -
THE EFFECTS OF TRIPLET PERTURBERS ON PHOTOPHYSICAL PROCESSES IN ACETYLENE
Drucker, Stephen; O'Brien, Jonathan P.; Patel, Paresh; Field, R. W. ( 1996 )We have recorded excitation spectra of the acetylene $\tilde{A}A_{u}\leftarrow \tilde{X}^{1}\Sigma^{+}_{u}$ transition by measuring simultaneously the total emission in two spectral regions: UV (200-400 nm) and NIR (0.9-1.5 ... -
An Efficient Approximate Method for Calculating Pressure Shifting Coefficients.
Chwaqui, Claudio; Le Roy, Robert J. ( 1990 )While high quality spectroscopic data of Van der Waals complexes remain the best single source of information about intermolecular potential energy surfaces, those data are most sensitive to the region near the intermolecular ... -
EIGENSTATE RESOLVED DOUBLE RESONANCE STUDY OF BENZENE INTRAMOLECULAR VIBRATIONAL ENERGY REDISTRIBUTION IN THE C-H STRETCH FIRST OVERTONE REGION: A GOOD CANDIDATE FOR A SUCCESSFUL TIER MODEL ANALYSIS.
Callegari, A.; Srivastava, H. K.; Engels, P.; Lehmann, K. K.; Scoles, G. ( 1997 )The mid-resolution $(\sim 1 cm^{-1})$ infrared spectrum of benzene $C_{6}H_{6}$ in the region of the first C-H stretching overtone (around $6000 cm^{-1}$) contains at least 30 distinct bands spread over a range of $300 ... -
EIGENSTATE RESOLVED INFRARED AND INFRARED-INFRARED DOUBLE RESONANCE STUDY OF BENZENE VIBRATIONAL RELAXATION IN THE C-H STRETCH FIRST OVERTONE REGION
Callegari, A.; Srivastava, H. K.; Lehmann, K. K.; Scoles, G.; Merker, U. ( 1996 )The eigenstate resolved, infrared spectrum of benzene, $C_{6}H_{6}$ was recorded in the region of the first C-H stretching overtone ($6000 cm^{-1}$). The spectrum was observed using a molecular beam laser spectrometer ... -
EIGENSTATE RESOLVED INFRARED AND MILLIMETER WAVE- INFRARED DOUBLE RESONANCE STUDY OF METHYLAMINE IN THE N-H STRETCH OVERTONE REGION
Srivastava, H. K.; Callegari, A.; Lehmann, K. K.; Scoles, G.; Merker, U. ( 1996 )The infrared spectrum of methylamine, $CH_{3}NH_{2}$, was recorded in the region of the $\nu_{1} + \nu_{10}$ N-H stretching overtone ($6600 cm^{-1}$), using a molecular beam laser spectrometer with optothermal detection. ... -
EIGENSTATE RESOLVED INFRARED SPECTROSCOPY OF 1,1,1,-$d_{3}$-ETHANE IN THE REGION AROUND $5900 CM^{-1}$
Dolce, J. W.; Callegari, A.; Srivastava, H. K.; Lehmann, K. K.; Scoles, G. ( 1996 )This talk will describe results which are part of a series of experiments studying intramolecular vibrational energy redistribution (IVR) in medium size molecules containing a methyl group. Last year we reported on ...