title: Low temperature pressure broadening of NH3 by D2.
abstract: We report experimentally measured cross sections for pressure broadening of ammonia inversion transitions by J=0, ortho-D2 at temperatures of 18-40 K. These measurements were made in a quasiequilibrium cell using the collisional cooling technique. Cross sections for broadening of the metastable (J,K)=(1, 1), (2, 2) and (3, 3) inversion transitions ranged from 67.5 A2 for (1, 1) at 20.0 K to 100.1 A2 for (3, 3) at 25.0 K. The J=0, ortho-D2 cross sections were found to be consistently larger than previously measured cross sections for low temperature broadening of NH3 by both He and H2.
authors.affiliation: Department of Physics, Allegheny College, Meadville, Pennsylvania 16335, USA. dwilley@allegheny.edu
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Willey
authors.forename: Robert E
authors.initials: RE
authors.lastname: Timlin
authors.forename: Charles D
authors.initials: CD
authors.lastname: Ruggiero
authors.forename: Ibrahim A
authors.initials: IA
authors.lastname: Sulai