Simple analytic form for the velocityangularmomentum distribution function of drifting linear ions
Abstract
A simple analytic form is presented for the full velocityangularmomentum distribution function for gasphase linear ions drifting in an atomic bath gas under a constant external electric field. Predictions of temperatures, drift velocities, and alignment parameters from this form are compared in detail against moleculardynamics calculations for NO^{+} drifting in helium. The form is accurate, compact, and based upon a physically motivated expansion. In essence, simple Maxwellianlike functions are generalized by allowing appropriate temperatures to become functions of velocity and rotational angular momentum. Over a wide range of reduced field strengths, including the equilibrium state, this form is able to account accurately for many properties at a microscopic level with only a few adjustable parameters.
 Publication:

Physical Review A
 Pub Date:
 March 2001
 DOI:
 10.1103/PhysRevA.63.032503
 Bibcode:
 2001PhRvA..63c2503B
 Keywords:

 33.15.e;
 34.10.+x;
 34.50.s;
 Properties of molecules;
 General theories and models of atomic and molecular collisions and interactions;
 Scattering of atoms and molecules