@article {346,
	title = {Collision-induced alignment of NO+ drifting in argon: Calculated distribution functions and microscopic quadrupole alignment parameters},
	journal = {Journal of Chemical Physics},
	volume = {116},
	number = {15},
	year = {2002},
	note = {ISI Document Delivery No.: 537PGTimes Cited: 5Cited Reference Count: 32},
	month = {Apr},
	pages = {6605-6613},
	type = {Article},
	abstract = {Molecular dynamics simulations of NO+ drifting in argon are presented. In this system, the ion-bath gas mass ratio is close to but less than unity, thus increasing the importance of inelastic collisions. Strong velocity-angular momentum coupling is found, and in particular the quadrupolar alignment parameter as a function of the velocity parallel with the field takes on, with decreasing velocities, values that start as negative, become positive, and subsequently decay toward negative. To the best of our knowledge, this is the first report of the decay of this alignment towards negative values at the low end of the velocity distribution. The accuracy of an approximate distribution function [R. Baranowski and M. Thachuk, Phys. Rev. A 63, 032503 (2001)] is also examined in detail. It is found to give results that are generally qualitatively correct, and for many properties, semiquantitatively correct as well. The agreement, however, is not as good as that found for systems with ion-bath gas ratios greatly exceeding unity. (C) 2002 American Institute of Physics.},
	keywords = {AR-NO+, ATOMIC GASES, EXPANSIONS, ION MOBILITY SPECTROMETRY, MOLECULAR-DYNAMICS, ROTATIONAL ALIGNMENT, SCATTERING, SUPERSONIC, SURFACES, TRANSPORT, VELOCITY DISTRIBUTIONS},
	isbn = {0021-9606},
	url = {<Go to ISI>://000174767200023},
	author = {Chen, X. and Araghi, R. and Baranowski, R. and Thachuk, M.}
}
@article {5007,
	title = {Analysis of physical observables and approximate distribution functions for drifting linear ions},
	journal = {Physical Review A},
	volume = {64},
	number = {6},
	year = {2001},
	note = {ISI Document Delivery No.: 500CKTimes Cited: 3Cited Reference Count: 22},
	month = {Dec},
	pages = {13},
	type = {Article},
	abstract = {The accuracy of two recently proposed approximate distribution functions for drifting linear ions [R. Baranowski and M. Thachuk, Phys. Rev. A 63, 032503 (2001) is tested at a number of levels of microscopic detail. Through formal mathematical manipulations. low-order expressions are derived for a number of physical observables, including the angular momentum dependence of the drift velocity, and parallel and perpendicular translational temperatures. as well as the dependence of the quadrupolar alignment parameter on the parallel and perpendicular velocity components. Finally, comparisons are made between the approximate forms and basis set expansions of the distribution function utilized in formal solutions of the Boltzmann equation, with the goal of suggesting general features of these basis sets that might help improve convergence.},
	keywords = {ATOMIC GASES, COLLISIONAL ALIGNMENT, DYNAMICS, MOLECULES, ROTATIONAL ALIGNMENT, SCATTERING, SUPERSONIC EXPANSIONS, SYSTEMS, TRANSPORT-COEFFICIENTS, VELOCITY DISTRIBUTIONS},
	isbn = {1050-2947},
	url = {<Go to ISI>://000172608200050},
	author = {Baranowski, R. and Thachuk, M.}
}
@article {5009,
	title = {Molecular dynamics study of the collision-induced rotational alignment of N-2(+) drifting in helium},
	journal = {Journal of Chemical Physics},
	volume = {114},
	number = {15},
	year = {2001},
	note = {ISI Document Delivery No.: 418VGTimes Cited: 9Cited Reference Count: 32},
	month = {Apr},
	pages = {6662-6671},
	type = {Article},
	abstract = {The full velocity-angular momentum distribution function for gas-phase N-2(+) drifting in helium is calculated using a molecular dynamics method, and utilized to examine collision-induced rotational alignment in detail. These results are also compared with experimental measurements, most especially those of Anthony [J. Chem. Phys. 112, 10269 (2000)] and those appearing in the preceding article [Anthony , J. Chem. Phys. 114, 6654 (2001)]. Both the calculations and experiments show a number of interesting features including, drift velocities which depend upon rotational state, and quadrupolar alignment parameters which change from negative at high velocities to positive at low velocities. (C) 2001 American Institute of Physics.},
	keywords = {EXCITATION, GENERALIZED CROSS-SECTIONS, HE, IONS, KINETIC-THEORY, LIGHTER GASES, STATE, TRANSPORT, TUBE EXPERIMENTS, VELOCITY DISTRIBUTIONS},
	isbn = {0021-9606},
	url = {<Go to ISI>://000167914400020},
	author = {Baranowski, R. and Wagner, B. and Thachuk, M.}
}
