Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Oscillatory behavior and trajectory-dependent effects in the population of He(3/sup 3/P) and He(3/sup 1/P) in He/sup +/-H/sub 2/, He/sup +/-D/sub 2/ and H/sub 2//sup +/-He collisions

Thesis/Dissertation ·
OSTI ID:6450045

To investigate a simple triatomic system, various measurements were performed to elucidate the excitation mechanisms of the (He-H/sub 2//D/sub 2/)/sup +/ quasimolecule. The include total cross section measurements of the magnetic substates of the He(3/sup 3/P) level populated in He/sup +/-H/sub 2/, He/sup +/-D/sub 2/ and He/sub 2//sup +/-He collisions and the He(3/sup 1/P) level populated in He/sup +/-H/sub 2/ and He/sup +/-D/sub 2/ collisions. The cross sections show an oscillatory behavior which suggests that there are long-range interactions of the quasimolecular states (Rosenthal oscillations). The nature of the oscillatory structure is dependent upon the details of the potential curves of the (He-H/sub 2//D/sub 2/)/sup +/ complex. Use of the quasidatomic model allows construction of diabatic states that enable the identification of the dominant excitation channels. In addition to oscillatory structure, the m/sub 1/ = +/-1 cross sections exhibit an isotope shift both in relative velocity dependence and in the magnitude of the cross section for population of He(3/sup 1/P) and He(3/sup 3/P) in He/sup +/-H/sub 2//D/sub 2/ collisions. Similar shifts are predicted by theories of rotational coupling in ion-atom collisions and result from differences in the projectile trajectories for the different target masses.

Research Organization:
Nebraska Univ., Lincoln (USA)
OSTI ID:
6450045
Country of Publication:
United States
Language:
English

Similar Records

Excitation of the helium autoionizing states in He/sup +/+He collisions, between 3 and 140 keV
Journal Article · Thu Dec 31 23:00:00 EST 1981 · Phys. Rev. A; (United States) · OSTI ID:5541814
Isotopic velocity-dependent effects in He/sup +/+H/sub 2/ or D/sub 2/ collisions
Journal Article · Sun Jan 31 23:00:00 EST 1988 · Phys. Rev. A; (United States) · OSTI ID:5646486
Ionization during collisions of resonantly-excited Ne(3s{sup 1,3}P{sub 1}) atoms with H{sub 2} and D{sub 2} molecules
Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Soviet Physics - Technical Physics · OSTI ID:86384

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
DEUTERIUM
ELEMENTS
FLUIDS
GASES
HELIUM
HELIUM IONS
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 2 PLUS
HYDROGEN ISOTOPES
ION COLLISIONS
ION-ATOM COLLISIONS
ION-MOLECULE COLLISIONS
IONS
ISOTOPES
LIGHT NUCLEI
MOLECULAR IONS
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE GASES
STABLE ISOTOPES