Molecular Collision Cross Section of the CHF₃Molecule Due to Higher Order Interactions

Abstract

The lattice O{N) model, defined on a iarge but Unite three-dimensional cubic lattice, is studied using the Hamiltonian approach in bare perturbation theory in the broken phase.-Renormalization is carried out to O(Xo) and the results are compared with those obtained using the conventional Lagrangian approach in the infinite volume limit. Complete agreement is found between the two methods.

Pressure Broadening of J=1 ← 0 Rotational Line of Fluoroform Caused by Spherical Perturbers

“…G ra dua l l y, the p erturbi ng gas i s added and the l i ne wi dth m easured, hence, the di˜erence , resulti ng fro m col l i sions wi th the perturb er, can b e cal cul ated. The pressure bro adeni ng coe£ cient m easured for pure CHF i s 34 49 0 24 MHz/ T r. Thi s val ue i s m ore accura te tha n tho serep orted elsewhere obta ined at 293 K: 35 7 [12], [13], 35.32 [14] MHz/ T orr. Adj usted for the tem p erature dep endence of 0 82 0 0 3 [3]) these val ues and our resul ts m easured at 301 K agree wi thi n the experi m enta l erro r.…”

Rotational Relaxation of CH379Br Molecule Caused by Noble Gases and Spherical Perturbers

“…Studies of the pressure broadening coe¤cient C w (J 1 2 0 rotational line) of CHF 3 molecule colliding with noble gases and CH 4 or CCl 4 molecules have been reported earlier [24]. Only the dispersive, exchange and partly, inductive interactions % 1=b 10 were described, since the £uoroform molecule lacks a quadrupole moment q i 0.…”

“…Expressions appropriate for collisions of a symmetric molecule which exhibits a nonzero dipole moment and zero quadrupole moment, with noble gas and spherical molecules have been published [24]. Hence, for these interactions and including the inductive forces which occur whenever the quadrupole moment does not vanish, one may cast the Sb function as:…”