2002
DOI: 10.1063/1.1461826
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Collision-induced alignment of NO+ drifting in argon: Calculated distribution functions and microscopic quadrupole alignment parameters

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 knowle… Show more

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Cited by 5 publications
(2 citation statements)
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“…The observed effects result from myriads of collisions suffered by each molecule during the supersonic expansion. A global analysis of the phenomenon requires both the description at a single collision level and the consideration of the role of multiple events [18][19][20][21]. In addition, the outcome of each event must depend on features of the anisotropic intermolecular forces between the seeded molecule and the carrier atom, on the mass ratio between projectile atom and molecular target, on the initial and final rotational state, on the collision velocity, on the orbital angular momentum of the collisional complex and on the scattering angle.…”
Section: Alignment Mechanisms and Role Of Experimental Resolution Con...mentioning
confidence: 99%
See 1 more Smart Citation
“…The observed effects result from myriads of collisions suffered by each molecule during the supersonic expansion. A global analysis of the phenomenon requires both the description at a single collision level and the consideration of the role of multiple events [18][19][20][21]. In addition, the outcome of each event must depend on features of the anisotropic intermolecular forces between the seeded molecule and the carrier atom, on the mass ratio between projectile atom and molecular target, on the initial and final rotational state, on the collision velocity, on the orbital angular momentum of the collisional complex and on the scattering angle.…”
Section: Alignment Mechanisms and Role Of Experimental Resolution Con...mentioning
confidence: 99%
“…This mechanism elucidates the observations given in [11] where high rotational states (not relaxed) were probed and broadside flying molecules have been found to prevail in the fast front of a pulsed beam of CO seeded in He. These alignment mechanisms can be attenuated by events involving the transversal component of the molecular velocity: their average is more effective in the low velocity slip region, where the velocity distribution tends to be 'isotropic' [18][19][20][21].…”
Section: Alignment Mechanisms and Role Of Experimental Resolution Con...mentioning
confidence: 99%