Radiative lifetimes and hyperfine constants for the 3d complex of molecular hydrogen

1978 ◽  
Vol 56 (7) ◽  
pp. 827-837 ◽  
Author(s):  
C. W. T. Chien ◽  
F. W. Dalby ◽  
J. Van Der Linde
Keyword(s):  
Hyperfine Structure ◽  
Cross Sections ◽  
Molecular Hydrogen ◽  
Molecular Properties ◽  
Radiative Lifetimes ◽  
Hyperfine Constants ◽  
Complete Basis ◽  
Hanle Effect ◽  
Doubly Excited ◽  
G Factors

Accurate experimental radiative lifetimes, disalignment cross sections, hyperfine constants, and Zeeman g factors are reported for a number of rotational levels of the 3d electronic complex and the nearby doubly excited K1Σg+ state of molecular hydrogen. The 3d complex of states is not a complete basis for calculation of the above molecular properties. A theory of the Hanle effect in the presence of hyperfine structure is presented.

Zero Field Level Crossing in Excited States of Molecular Hydrogen

1972 ◽  
Vol 50 (3) ◽  
pp. 287-297 ◽  
Author(s):  
J. van der Linde ◽  
F. W. Dalby
Keyword(s):  
Magnetic Field ◽  
Excited States ◽  
Cross Sections ◽  
Molecular Hydrogen ◽  
Half Width ◽  
Zero Field ◽  
Level Crossing ◽  
Radiative Lifetimes ◽  
Field Level ◽  
Π State

Zero field level crossing effects have been observed in the lines emitted from the J = 1, 2, and 3 rotational levels of the [Formula: see text] state of molecular hydrogen excited in an r.f. discharge. The polarization of the R(0), R(1), and R(2) lines of the 3d1Σ → 2p1Σ(0 → 0) band as a function of magnetic field was observed to be Lorentzian, and using the Landé g factors measured by Dieke et al. yields radiative lifetimes of 2.66 × 10−8 s, 3.83 × 10−8 s, and 3.93 × 10−8 s for J = 1,2, and 3 respectively. The half-width of the level crossing curves was observed to vary linearly with pressure in the range 15 m Torr to 90 m Torr and yield collision cross sections of [Formula: see text] for all three states. The source of the discrepancy between the first and the latter two lifetimes is discussed. The lifetime of the J = 21, 3d1Π state has also been measured with less precision and yields 3.84 × 10−8 s.

Further investigations of charge exchange and electron detachment - I. Ion energies 3 to 40 keV - II. Ion energies 100 to 4000 eV

1955 ◽  
Vol 227 (1171) ◽  
pp. 466-486 ◽  
Keyword(s):  
Charge Transfer ◽  
Energy Range ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Molecular Hydrogen ◽  
Hydrogen Ions ◽  
Electron Detachment ◽  
Rare Gases ◽  
Helium Ions ◽  
Ion Energies

This paper describes the measurement of charge transfer cross-sections for protons, molecular hydrogen ions and helium ions in the rare gases and hydrogen, and electron detachment cross-sections for negative atomic hydrogen ions in the rare gases. Part I describes the energy range 3 to 40 keV. In part II the energy range 100 to 4000 eV is described, and the results are discussed in terms of the pseudo-adiabatic hypothesis. Comparisons are made with other experimental results, and anomalous molecular cases are discussed in terms of reactions involving anti-bonding states.

Radiative Lifetimes and Collisional Cross Sections for Xe i and ii

1969 ◽  
Vol 59 (7) ◽  
pp. 842 ◽  
Author(s):  
L. Allen ◽  
D. G. C. Jones ◽  
D. G. Schofield
Keyword(s):  
Cross Sections ◽  
Radiative Lifetimes

Investigation of the Spin Hamiltonian Parameters of Yb3+ in CaWO4 Crystal

2004 ◽  
Vol 59 (12) ◽  
pp. 943-946 ◽  
Author(s):  
Hui-Ning Dong ◽  
Shao-Yi Wu
Keyword(s):  
Hyperfine Structure ◽  
Local Structure ◽  
Reasonable Agreement ◽  
Second Order ◽  
Order Perturbation ◽  
Superposition Model ◽  
Spin Hamiltonian ◽  
Structure Constants ◽  
Hamiltonian Parameters ◽  
G Factors

In this paper, the spin Hamiltonian parameters g factors g∥ and g⊥ of Yb3+ and hyperfine structure constants A∥ and A⊥ of 171Yb3+ and 173Yb3+ in CaWO4 crystal are calculated from the two-order perturbation formulae. In these formulae, the contributions of the covalence effects, the admixture between J =7/2 and J =5/2 states as well as the second-order perturbation are included. The needed crystal parameters are obtained from the superposition model and the local structure of the studied system. The calculated results are in reasonable agreement with the observed values. The results are discussed.

Formation of metastable atomic hydrogen in the 2sstate from symmetry-resolved doubly excited states of molecular hydrogen

2011 ◽  
Vol 84 (5) ◽  
Author(s):  
Takeshi Odagiri ◽  
Yoshiaki Kumagai ◽  
Motoyoshi Nakano ◽  
Takehiko Tanabe ◽  
Isao H. Suzuki ◽  
...  
Keyword(s):  
Excited States ◽  
Atomic Hydrogen ◽  
Molecular Hydrogen ◽  
Doubly Excited States ◽  
Doubly Excited
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