Absolute elastic differential electron scattering cross sections in the intermediate energy region. I. H$sub 2$

Journal Article · Mon Sep 15 00:00:00 EDT 1975 · J. Chem. Phys., v. 63, no. 6, pp. 2659-2665

OSTI ID:4149958

Srivastava, S K; Chutjian, A; Trajmar, S

A new method for measuring absolute electron-impact differential cross sections (DCS) for elastic scattering in gases is described. The technique uses a well-defined crossed-beam scattering geometry in which the relative target densities of an unknown and a secondary standard gas are accurately determined by a calibrated flowmeter and a pressure gauge. The method is applied to the measurement of elastic scattering from H$sub 2$ (which, in the present work, also includes rotational excitation) relative to elastic scattering from He, the secondary standard. The relative DCS for H$sub 2$ are then placed on the absolute scale by using recently measured absolute elastic DCS for He. Measurements for H$sub 2$ are reported at incident electron energies of 3--75 eV, and in the angular range 20degree--135degree. Differential and integral cross sections at each energy are compared with previous measurements and recent theoretical calculations.

• Research Organization: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91103
• NSA Number: NSA-33-003973
• OSTI ID: 4149958
• Journal Information: J. Chem. Phys., v. 63, no. 6, pp. 2659-2665, Other Information: Orig. Receipt Date: 30-JUN-76
• Country of Publication: United States
• Language: English

Related Subjects

N60200* -Physics (Atomic & Molecular)-Atomic & Molecular Properties
N60400 -Physics (Atomic & Molecular)-Collision Phenomena
640302* -Physics Research-Atomic
Molecular & Chemical Physics-Atomic & Molecular Properties
*HYDROGEN- ELECTRON-MOLECULE COLLISIONS
ANGULAR DISTRIBUTION
ELASTIC SCATTERING
EV RANGE 01-10
EV RANGE 10-100