Dependence of electron-impact dissociative excitation cross sections on the initial vibrational quantum number in H[sub 2] and D[sub 2] molecules: [ital X] [sup 1][Sigma][sub g][sup +][r arrow]B [sup 1][Sigma][sub u][sup +] and [ital X] [sup 1][Sigma][sub g][sup +][r arrow]C [sup 1][Pi][sub u] transitions

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.4778· OSTI ID:6804245

Celiberto, R; Lamanna, U T; Capitelli, M ^[1]

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1. Centro di Studio per la Chimica dei Plasmi del Consiglio Nazionale delle Ricerche, Bari (Italy) Dipartimento di Chimica, Universita di Bari, Bari (Italy)

Electron-impact dissociative cross sections for H[sub 2] and D[sub 2] vibrationally excited molecules have been calculated in the frame of the impact-parameter method for dissociative processes involving direct dissociation [ital M][sub 2]([ital X] [sup 1][Sigma][sub [ital g]][sup +],[ital v][sub [ital i]])+[ital e][minus][gt][ital M][sub 2][sup *]([ital B] [sup 1][Sigma][sub [ital u]][sup +], [sup 1][Pi][sub u])+e[r arrow]2[ital M]+[ital e] and radiative cascade [ital M][sub 2]([ital X] [sup 1][Sigma][sub [ital g]][sup +],[ital v][sub [ital i]]) +[ital e][r arrow][ital M][sub 2][sup *]([ital B] [sup 1][Sigma][sub [ital u]][sup +],[ital C][sup 1][Pi][sub [ital u]])+[ital e][r arrow][ital M][sub 2]([ital X] [sup 1][Sigma][sub [ital g]][sup +])+[ital e]+[ital h][nu][r arrow]2[ital M]+[ital e]+[ital h][nu] ([ital M][sub 2] represents a hydrogen or deuterium molecule). The results show that direct dissociation cross sections strongly depend on the initial vibrational state of the molecule, while an opposite behavior is found in the case of dissociation by radiative cascade. Moreover, for this last process, the fraction of molecules that undergoes dissociation has been evaluated with respect to the total cascade process, yielding in general quite small values in both the H[sub 2] and D[sub 2] cases.

• OSTI ID: 6804245
• Journal Information: Physical Review A; (United States), Vol. 50:6; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DEUTERIUM
ELECTRON-MOLECULE COLLISIONS
HYDROGEN
PLASMA
ION SOURCES
BREMSSTRAHLUNG
CROSS SECTIONS
CUSPED GEOMETRIES
DEUTERIUM IONS
DISSOCIATION
EXCITATION
HYDROGEN IONS
RADIATIVE DECAY
SENSITIVITY
VIBRATIONAL STATES
CHARGED PARTICLES
COLLISIONS
DECAY
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HYDROGEN ISOTOPES
IONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC FIELD CONFIGURATIONS
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OPEN CONFIGURATIONS
PARTICLE DECAY
RADIATIONS
STABLE ISOTOPES
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)
700330 - Plasma Kinetics
Transport
& Impurities- (1992-)