@article {3473,
	title = {MU+NO - KINETIC ISOTOPE EFFECTS IN UNIMOLECULAR DISSOCIATION},
	journal = {Journal of Physical Chemistry},
	volume = {99},
	number = {47},
	year = {1995},
	note = {ISI Document Delivery No.: TF811Times Cited: 10Cited Reference Count: 80},
	month = {Nov},
	pages = {17160-17168},
	type = {Article},
	abstract = {The thermal addition reaction Mu + NO + M reversible arrow MuNO* + M has been studied by a longitudinal magnetic field muon spin relaxation (mu SR) technique, at room temperature, in the presence of up to 60 atm of N-2 as inert moderator. The pressure dependence of the effective rate constant for Mu addition (k(eff)) demonstrates that the system remains well in the low-pressure regime in this pressure range. The termolecular rate constant, k(0)(Mu) = (8.76 +/- 0.46) x 10(-33) cm(6) molecule(-2) s(-1), is about 5 times smaller than that reported for the corresponding H-atom reaction (Tsang, W.; Herron, J. T. J. Phys. Chem. Ref. Data 1991, 20, 609), the largest isotope effect of its kind yet reported for reactions of this nature and most likely due to the increased rate of MuNO* dissociation resulting from the much lighter mass of the Mu atom (m(Mu)/m(H) similar to 1/9). This result should provide an important test of theoretical calculations for dissociating molecules involving few degrees of freedom. Quantum tunneling, normally facile for the much lighter Mu atom, is unlikely to play a major role in establishing the isotope effect seen in k(0). In the present instance, the mu SR technique relies on measuring the relaxation rate for the chemical process of addition (lambda(c)) in competition with that for spin exchange (lambda(se)), with the NO unpaired electron. The pressure-independent average value for the spin exchange rate constant found, k(se) = (3.00 +/- 0.12) x 10(-10) cm(3) molecule(-1) s(-1), is in good agreement with previous values obtained by transverse field mu SR (Fleming, D. G., et al. J. Chem. Phys. 1980, 73, 2751).},
	keywords = {CHANNEL MODEL-CALCULATIONS, CHARACTERIZATION, ELECTRON-SPIN EXCHANGE, H+CH3->CH4 RECOMBINATION, INTERPOLATED, MICROCANONICAL VARIATIONAL THEORY, PARTITION-FUNCTION, POTENTIAL-ENERGY, PRESSURE-DEPENDENCE, RADICAL RECOMBINATION, RATE CONSTANTS, SURFACES, THEORETICAL},
	isbn = {0022-3654},
	url = {<Go to ISI>://A1995TF81100019},
	author = {Pan, J. J. and Senba, M. and Arseneau, D. J. and Gonzalez, A. C. and Kempton, J. R. and Fleming, Donald G.}
}
@article {2996,
	title = {SUB-DOPPLER SPECTROSCOPY OF THIOFORMALDEHYDE - EXCITED-STATE PERTURBATIONS AND EVIDENCE FOR ROTATION-INDUCED VIBRATIONAL MIXING IN THE GROUND-STATE},
	journal = {Journal of Chemical Physics},
	volume = {101},
	number = {9},
	year = {1994},
	note = {ISI Document Delivery No.: PP519Times Cited: 9Cited Reference Count: 50},
	month = {Nov},
	pages = {7300-7310},
	type = {Article},
	abstract = {High-resolution intracavity dye laser spectroscopy has been used to obtain sub-Doppler spectra of transitions to 350 rotational levels in the 4(0)(1) band of the ($) over tilde A (1)A(2)-($) over tilde X (1)A(1) electronic transition of thioformaldehyde. Ground state combination differences from the sub-Doppler spectra, combined with microwave and infrared data, have been used to improve the ground state rotational and centrifugal distortion constants of H2CS. The upper state shows a remarkable number of perturbations. The largest of these are caused by nearby triplet levels, with matrix elements of 0.05-0.15 cm(-1). A particularly clear singlet-triplet avoided crossing in K-a{\textquoteright} = 7 has been shown to be caused by interaction with the F-1 component of the 3(1)6(2) vibrational level of the ($) over tilde a (3)A(2) state. At least 53\% of the S-1 levels show evidence of very small perturbations by high rovibronic levels of the ground state. The number of such perturbations is small at low J, but increases rapidly beyond J=5 such that 40\%-80\% of the observed S-1 levels of any given J are perturbed by ground state levels. Model calculations show that the density and J dependence of the number of perturbed levels can be explained if there is extensive rotation-induced mixing of the vibrational levels in the ground state.},
	keywords = {ANTICROSSING SPECTROSCOPY, HIGH ROVIBRONIC LEVELS, HIGH-RESOLUTION, LASER, LEVEL, OPTICAL DOUBLE-RESONANCE, POLYATOMIC-MOLECULES, POTENTIAL-ENERGY, PYROLYSIS JET SPECTROSCOPY, QUANTUM BEAT SPECTROSCOPY, SINGLET-TRIPLET PERTURBATIONS, SPECTROSCOPY, SURFACES},
	isbn = {0021-9606},
	url = {<Go to ISI>://A1994PP51900012},
	author = {Clouthier, D. J. and Huang, G. and Adam, A. G. and Merer, A. J.}
}
