@article {1121,
	title = {Theoretical studies of alkyl radicals in the NaY and HY zeolites},
	journal = {J. Phys. Chem. A},
	volume = {109},
	number = {32},
	year = {2005},
	note = {ISI Document Delivery No.: 954TRTimes Cited: 8Cited Reference Count: 68},
	month = {Aug},
	pages = {7242-7250},
	type = {Article},
	abstract = {<p>Interplay of quantum mechanical calculations and experimental data on hyperfine coupling constants of ethyl radical in zeolites at several temperatures was engaged to study the geometries and binding energies and to predict the temperature dependence of hyperfine splitting of a series of alkyl radicals in zeolites for the first time. The main focus is on the hyperfine interaction of alkyl radicals in the NaY and HY zeolites. The hyperfine splitting for neutral free radicals and free radical cations is predicted for different zeolite environments. This information can be used to establish the nature of the muoniated alkyl radicals in the NaY and HY zeolites via mu SR experiments. The ration hyperfine coupling constants of the ethane radical cation in these zeolites are very large with relatively little dependence on temperature. It was found that the intramolecular dynamics of alkyl free radicals are only weakly affected by their strong binding to zeolites. In contrast, the substrate binding has a significant effect on their intermolecular dynamics.</p>},
	keywords = {CYCLOHEXADIENYL RADICALS, DENSITY-FUNCTIONAL CALCULATIONS, ELECTRON-SPIN-RESONANCE, ethyl, GAS-PHASE, HYPERFINE COUPLING-CONSTANTS, INTERNAL-ROTATION, INTRAMOLECULAR MOTION, METHYL, REORIENTATIONAL DYNAMICS},
	isbn = {1089-5639},
	url = {<Go to ISI>://000231178300029},
	author = {K. Ghandi* and Zahariev, F. E. and Wang, Y. A.}
}
@article {4095,
	title = {Addition reactions and longitudinal field spin relaxation of small radicals in gases: Mu+CO and Mu+N2O},
	journal = {Hyperfine Interactions},
	volume = {106},
	number = {1-4},
	year = {1997},
	note = {ISI Document Delivery No.: XB055Times Cited: 4Cited Reference Count: 297th International Conference on Muon Spin Rotation, Relaxation, ResonanceAPR 15-19, 1996NIKKO, JAPANUniv Tokyo, Meson Sci Lab, Inst Phys \& Chem Res, Muon Sci Lab},
	pages = {181-186},
	type = {Proceedings Paper},
	abstract = {Muon spin relaxation has been measured in longitudinal magnetic fields for Mu + CO and Mu + N2O reactions. The interpretation of the results for these small molecules, which are quite different than those obtained in larger molecule systems (e.g., Mu-ethyl and Mu-t-butyl radicals), are made with the phenomenological model for Mu-radical spin relaxation previously proposed. Proper fitting procedures are important in these cases and are discussed in the present paper.},
	keywords = {DEPENDENCE, DYNAMICS, EXCHANGE, HYPERFINE COUPLING-CONSTANTS, PHASE, RESONANCE},
	isbn = {0304-3843},
	url = {<Go to ISI>://A1997XB05500026},
	author = {Pan, J. J. and Arseneau, D. J. and Senba, M. and Shelley, M. and Fleming, Donald G.}
}
@article {3664,
	title = {Spin relaxation of muonium-substituted ethyl radicals (MuCH(2)CH(2)) in the gas phase},
	journal = {Journal of Chemical Physics},
	volume = {105},
	number = {17},
	year = {1996},
	note = {ISI Document Delivery No.: VP288Times Cited: 20Cited Reference Count: 84},
	month = {Nov},
	pages = {7517-7535},
	type = {Article},
	abstract = {The spin relaxation of the muonium-substituted ethyl radical (MuCH(2)CH(2)) and its deuterated analog (MuCD(2)CD(2)) has been studied in the gas phase in both transverse and longitudinal magnetic fields spanning the range similar to 0.5-35 kG, over a pressure range from similar to 1-16 atm at ambient temperature. The Mu(13)CH(2)(13)CH(2) radical has also been investigated, at 2.7 atm. For comparison, some data is also reported for the MuCH(2)C(CH3)(2) (Mu-t-butyl) radical at a pressure of 2.6 atm. This experiment establishes the importance of the mu SR technique in studying spin relaxation phenomena of polyatomic radicals in the gas phase, where equivalent ESR data is sparse or nonexistent. Both T-1 (longitudinal) and T-2 (transverse) mu SR relaxation rates are reported and interpreted with a phenomenological model. Relaxation results from fluctuating terms in the spin Hamiltonian, inducing transitions between the eigenstates assumed from an isotropic hyperfine interaction. Low-field relaxation is primarily due to the electron, via both the nuclear hyperfine (S . A . I) and the spin rotation interactions (S . J), communicated to the muon via the isotropic muon-electron hyperfine interaction. At the highest fields, direct spin flips of the muon become important, due to fluctuations in the anisotropic part of the muon-electron hyperfine interaction. In the intermediate held region a muon-electron {\textquoteright}{\textquoteright}flip-flop{\textquoteright}{\textquoteright} relaxation mechanism dominates, due partly to the anisotropic hyperfine interaction and partly to modulation of the isotropic muon-electron hyperfine coupling. In the case of the T-2 rates, electron relaxation mechanisms dominate over a much wider field range than for the T-1 rates, and inhomogeneous line broadening also contributes. The fluctuations that induce both the T-1 and T-2 relaxation rates are described by a single correlation time, tau(c), inversely proportional to the pressure. An effective spin-reorientation cross section is deduced from this pressure dependence, sigma(J) similar to 100+/-20 Angstrom(2), for all topically substituted ethyl radicals. This is similar to the geometrical cross section, but about a factor of 4 larger than values of sigma(J) found for similar-sized diamagnetic molecules by gas phase NMR, primarily reflecting the longer range of the electron-induced intermolecular potential. (C) 1996 American Institute of Physics.},
	keywords = {ADDITION-REACTIONS, DYNAMICS, EXCHANGE, HYPERFINE COUPLING-CONSTANTS, INTERNAL-ROTATION, LATTICE RELAXATION, LEVEL-CROSSING, MAGNETIC-RESONANCE, MUONATED RADICALS, ORGANIC FREE-RADICALS, SPECTROSCOPY},
	isbn = {0021-9606},
	url = {<Go to ISI>://A1996VP28800027},
	author = {Fleming, Donald G. and Pan, J. J. and Senba, M. and Arseneau, D. J. and Kiefl, R. F. and Shelley, M. Y. and Cox, S. F. J. and Percival, P. W. and Brodovitch, J. C.}
}
