Negative ion electron impact studies of arsenic trihalides: AsF/sub 3/, AsCl/sub 3/, and AsBr/sub 3/

Journal Article · Sun Aug 15 00:00:00 EDT 1976 · J. Chem. Phys.; (United States)

OSTI ID:7175526

Pabst, R E; Bennett, S L; Margrave, J L; Franklin, J L

Low energy eleAsF/sup 2/-tron impact of AsF/sub 3/, AsCl/sub 3/, and AsBr/sub 3/ gases gave many ions by dissociative resonance capture. Appearance potentials have been determined by deconvolution of the capture curves, and translational energies of the majority of the ions have been measured through the resonance processes. The X/sup -/ ions are formed along with electronically excited neutral AsX/sub 2/, and the results allow the electronic transition energies to be determined: 7.3, 4.3, and 2.6 eV for AsF/sub 2/, AsCl/sup 2/, and AsBr/sup 2/, respectively. From the processes giving AsX/sup -2/+X, the experimental data allow the heats of formation of the negative ions ..delta..H/subf/(AsX/sup -2/) to be derived: -129.7, -65.3, and -72.5 kcal mole/sup -1/ for AsF/sup -2/, AsCl/sup -2/, and AsBr/sup -2/, respectively. The ions AsCl/sup -/ and AsBr/sup -/ appear to be formed along with electronically excited X/sub 2/ neutral: ..delta..H/subf/(AsCl/sup -/) =-2.2 kcal mole/sup -1/ and ..delta..H/subf/(AsBr/sup -/) =1.7 kcal mole/sup -1/ are derived. The ions X/sup -2/ appear to be formed with electronically excited AsX neutral, allowing the electronic transition energies to be derived: E*/sub el/(AsBr) >0.6 eV and E*/sub el/(AsCl) =2.5 eV. (AIP)

• Research Organization: Department of Chemistry, Rice University, Houston, Texas 77001
• OSTI ID: 7175526
• Journal Information: J. Chem. Phys.; (United States), Vol. 65:4
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARSENIC BROMIDES
ELECTRON-MOLECULE COLLISIONS
ARSENIC CHLORIDES
ARSENIC FLUORIDES
ELECTRON ATTACHMENT
DISSOCIATION
IONIZATION
ARSENIC COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COLLISIONS
ELECTRON COLLISIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MOLECULE COLLISIONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena