@article {1515,
	title = {Termolecular kinetics for the Mu+CO+M recombination reaction: A unique test of quantum rate theory},
	journal = {Journal of Chemical Physics},
	volume = {125},
	number = {1},
	year = {2006},
	note = {ISI Document Delivery No.: 061CTTimes Cited: 0Cited Reference Count: 66Pan, James J. Arseneau, Donald J. Senba, Masayoshi Garner, David M. Fleming, Donald G. Xie, Tiao Bowman, Joel M.},
	month = {Jul},
	pages = {13},
	type = {Article},
	abstract = {The room-temperature termolecular rate constants, k(0), for the Mu+CO+M reversible arrow MuCO+M (M=He, N-2, Ar) recombination reaction have been measured by the mu SR technique, and are reported for moderator gas pressures of up to similar to 200 bar (densities less than or similar to 0.4x10(22) molec cm(-3)). The experimental relaxation rates reveal an unusual signature, in being dominated by the electron spin-rotation interaction in the MuCO center dot radical that is formed in the addition step. In N-2 moderator, k(0)=1.2 +/- 0.1x10(-34) cm(6) s(-1), only about 30\% higher than found in Ar or He. The experimental results are compared with theoretical calculations carried out on the Werner-Keller-Schinke (WKS) surface [Keller , J. Chem. Phys. 105, 4983 (1996)], within the framework of the isolated resonance model (IRM). The positions and lifetimes of resonance states are obtained by solving the complex Hamiltonian for the nonrotating MuCO system, using an L-2 method, with an absorbing potential in the asymptotic region. Accurate values of the vibrational bound and resonance states of MuCO reveal unprecedented isotope effects in comparisons with HCO, due to the remarkable effect of replacing H by the very light Mu atom (m(Mu)approximate to 1/9m(H)). Due to its pronounced zero-point energy shift, there are only two (J=0) bound states in MuCO. Contributions from nonzero J states to the termolecular rate constants are evaluated through the J-shifting approximation, with rotational constants evaluated at the potential minimum. The value of the important A constant (181 cm(-1)) used in this approximation was supported by accurate J=K=1 calculations, from which A=180 cm(-1) was obtained by numerical evaluation. The calculations presented here, with a "weak collision factor" beta(c)=0.001, indicative of the very sparse density of MuCO states, give a very good account of both the magnitude and pressure dependence of the experimental rates, but only when the fact that the two initially bound (J=0) states become resonances for J > 0 is taken into account. This is the first time in IRM calculations of atom-molecule recombination reactions where J not equal 0 states have proven to be so important, thus providing a truly unique test of quantum rate theory. (c) 2006 American Institute of Physics.},
	keywords = {ADDITION-REACTIONS, DISSOCIATION DYNAMICS, FIELD-DEPENDENCE, GAS-PHASE, RATE-CONSTANT, RESOLUTION SPECTROSCOPIC DATA, RESONANCE ENERGIES, SPIN RELAXATION, thermal, THERMODYNAMIC PROPERTIES, UNIMOLECULAR, VIBRATIONALLY EXCITED DCO((X)OVER-TILDE(2)A{\textquoteright})},
	isbn = {0021-9606},
	url = {<Go to ISI>://000238849500019},
	author = {Pan, J. J. and Arseneau, D. J. and Senba, M. and Garner, D. M. and Fleming, Donald G. and Xie, T. and Bowman, J. M.}
}
@article {3879,
	title = {Muonium spin relaxation in carbon monoxide},
	journal = {Hyperfine Interactions},
	volume = {106},
	number = {1-4},
	year = {1997},
	note = {ISI Document Delivery No.: XB055Times Cited: 7Cited Reference Count: 127th International Conference on Muon Spin Rotation, Relaxation, ResonanceAPR 15-19, 1996NIKKO, JAPANUniv Tokyo, Meson Sci Lab, Inst Phys \& Chem Res, Muon Sci Lab},
	pages = {151-156},
	type = {Proceedings Paper},
	abstract = {The spin relaxation of Mu was measured in mixtures of CO and Ar al pressures up to 270 atm and at various magnetic fields. The relaxation rate increased with magnetic field in the way expected for electron spin-exchange processes, though the effect declined at high pressures. We describe the results in terms of spin relaxation of Mu-formyl radicals, MuCO, which break up to give depolarized Mu at low pressures, but are increasingly stabilized at higher pressures.},
	keywords = {CO REVERSIBLE HCO, EXCHANGE, FIELD-DEPENDENCE, UNIMOLECULAR DISSOCIATION, WIDTHS},
	isbn = {0304-3843},
	url = {<Go to ISI>://A1997XB05500021},
	author = {Arseneau, D. J. and Pan, J. J. and Senba, M. and Shelley, M. and Fleming, Donald G.}
}
