Theoretical study of the absorption spectra of the lithium dimer

Chung, H.‐K.; Kirby, K.; Babb, James F.

doi:10.1103/physreva.60.2002

Cited by 28 publications

(18 citation statements)

References 41 publications

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“…The phase information is particularly important for determining the resonant content of the mass-independent results. These mass-dependent fits used linear combinations of relativistic Breit-Wigner poles with mass-dependent widths and Blatt-Weisskopf barrier factors [41]. The details of this procedure are given below.…”

mentioning

confidence: 99%

Observation of pseudoscalar and axial vector resonances in π−p→K+K−π0n at 18 GeV

Adams

Bar‐Yam

et al. 2001

Physics Letters B

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mentioning

confidence: 99%

Observation of pseudoscalar and axial vector resonances in π−p→K+K−π0n at 18 GeV

Adams

Bar‐Yam

et al. 2001

Physics Letters B

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“…Depending on whether the molecular potentials have bound states formed by sodium and rare gas atoms, the total spectra consist of four possible transitions; bound-bound, bound-free, free-bound, free-free transitions. Details of quantum-mechanical formulation of each transition are described in our earlier papers [2,3]. Most important are the molecular potentials involved in the radiative transitions and a lot of care was taken into using the most accurate molecular potentials of sodium-rare gas di-molecules.…”

Section: Quantum-mechanical Methodsmentioning

confidence: 99%

Absorption spectra of broadened sodium resonance lines in presence of rare gases

Chung¹,

Shurgalin²,

Babb³

2002

AIP Conference Proceedings

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The pressure broadening of alkali-metal lines is a fundamental problem with numerous applications. For example, the sodium resonance lines broadened by xenon are important in the production of broad spectra emitted in the HPS (High-Pressure Sodium) lamp and they potentially can be used for gas condition diagnostics. Broadened absorption lines of alkali-metal atoms are prominent in the optical spectra of brown dwarfs and understanding the broadening mechanism will help elucidate the chemical composition and atmospheric properties of those stars. The far-line wing spectra of sodium resonance lines broadened by rare gases are found to exhibit molecular characteristics such as satellites and hence the total absorption coefficients for vapors of Na atoms and perturbing rare gas atoms can be modeled as Na-RG (rare gas) molecular absorption spectra. In this work, using carefully chosen interatomic potentials for Na-RG molecules we carry out quantum-mechanical calculations for reduced absorption coefficients for vapors composed of Na-He, Na-Ar, and Na-Xe. Calculated spectra are compared to available experimental results and the agreement is good in the measured satellite positions and shapes.

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“…According to Lam et al [1] and Chung et al [2], the absorption cross section from a ro-vibrational state of the lower electronic state (v , J , Λ ) to the ro-vibrational state of the upper electronic state (v , J , Λ ) is given by…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…At thermodynamic equilibrium, the number density of molecules in the electronic states N MΛ and number densities of atoms in the electronic states n AΛ and n BΛ , in which molecules dissociate, are related according to the mass action law [2,3]…”

Section: Of 20mentioning

confidence: 99%

High Temperature Optical Spectra of Diatomic Molecules at Local Thermodynamic Equilibrium

Beuc

Movre

Pichler

2018

Atoms

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In the paper, several theoretical approaches to the determination of the reduced absorption and emission coefficients under local thermodynamic equilibrium conditions were exposed and discussed. The full quantum-mechanical procedure based on the Fourier grid Hamiltonian method was numerically robust but time consuming. In that method, all transitions between the bound, free, and quasi-bound states were treated as bound–bound transitions. The semi-classical method assumed continuous energies of ro-vibrational states, so it did not give the ro-vibrational structure of the molecular bands. That approach neglected the effects of turning points but agreed with the averaged-out quantum-mechanical spectra and it was computer time efficient. In the semi-quantum approximation, summing over the rotational quantum number J was done analytically using the classical Franck–Condon principle and the stationary–phase approximation and its consumption of computer time was lower by a few orders of magnitude than the case of the full quantum-mechanical approach. The approximation described well the vibrational but not the rotational structure of the molecular bands. All the above methods were compared and discussed in the case of a visible and near infrared spectrum of LiHe, Li2, and Cs2 molecules in the high temperature range.

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Theoretical study of the absorption spectra of the lithium dimer

Cited by 28 publications

References 41 publications

Observation of pseudoscalar and axial vector resonances in π−p→K+K−π0n at 18 GeV

Observation of pseudoscalar and axial vector resonances in π−p→K+K−π0n at 18 GeV

Absorption spectra of broadened sodium resonance lines in presence of rare gases

High Temperature Optical Spectra of Diatomic Molecules at Local Thermodynamic Equilibrium

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