Atomic Physics with the Goddard High Resolution Spectrograph on theHubbleSpaceTelescope. IV. Relative Oscillator Strengths for Singly Ionized Nickel

1998 ◽  
Vol 498 (1) ◽  
pp. 256-260 ◽  
Author(s):  
J. Zsargo ◽  
S. R. Federman
Keyword(s):  
High Resolution ◽  
Atomic Physics ◽  
Oscillator Strengths

High resolution UV stellar spectroscopy with the HST/GHRS, challenges and opportunities for atomic physics

1993 ◽  
Vol T47 ◽  
pp. 149-156 ◽  
Author(s):  
David S Leckrone ◽  
Sveneric Johansson ◽  
Glenn M Wahlgren ◽  
Saul J Adelman
Keyword(s):  
High Resolution ◽  
Atomic Physics ◽  
Stellar Spectroscopy ◽  
Challenges And Opportunities

Oscillator strength study of the excitations of valence-shell of C2H2 by high-resolution inelastic x-ray scattering

2021 ◽  
Author(s):  
Qiang Sun ◽  
Ya-Wei Liu ◽  
Yuan-Chen Xu ◽  
Li-Han Wang ◽  
Tian-Jun Li ◽  
...  
Keyword(s):  
High Resolution ◽  
Theoretical Models ◽  
High Energy ◽  
Oscillator Strengths ◽  
Electron Collision ◽  
Valence Shell ◽  
X Ray ◽  
X Ray Scattering ◽  
Theoretical Results ◽  
Ray Scattering

Abstract The oscillator strengths of the valence-shell excitations of C2H2 are extremely important for testing theoretical models and studying interstellar gases. In this study, the high-resolution inelastic x-ray scattering (IXS) method is adopted to determine the generalized oscillator strengths (GOSs) of the valence-shell excitations of C2H2 at a photon energy of 10 keV. The GOSs are extrapolated to their zero limit to obtain the corresponding optical oscillator strengths (OOSs). Through taking a completely different experimental method of the IXS, the present results offer the high energy limit for electron collision to satisfy the first Born approximation (FBA) and cross-check the previous experimental and theoretical results independently. The comparisons indicate that an electron collision energy of 1500 eV is not enough for C2H2 to satisfy the FBA for the large squared momentum transfer, and the line saturation effect limits the accuracy of the OOSs measured by the photoabsorption method.

MULTIPOLE MATRIX ELEMENTS 〈nl|rβ|El'〉v FOR H-LIKE ATOMS AND THEIR APPLICATIONS (AS β = 1, n ≤ 4, Enl < 0 ≤ E ≤ 1)

2008 ◽  
Vol 22 (08) ◽  
pp. 937-965 ◽  
Author(s):  
V. F. TARASOV
Keyword(s):  
Differential Equation ◽  
Singular Point ◽  
Atomic Physics ◽  
Nuclear Charge ◽  
Dipole Moments ◽  
Oscillator Strengths ◽  
Matrix Elements ◽  
Auxiliary Parameter ◽  
Radial Functions ◽  
Line Intensities

This article deals with the connection between multipole matrix elements 〈nl|rβ|n'l'〉ν and 〈nl|rβ|El'〉ν for H-like atoms, where ν is the so-called "auxiliary" parameter of Heun's differential equation and [Formula: see text] is the "effective" nuclear charge, and new properties of Appell's function F2(x,y) to the vicinity of the singular point (1, 1) and in addition, here, first V. A. Fock's idea for the continuous spectrum is taken into consideration. Such an approach allows us to get the explicit expressions for squares of the dipole moments and the certain physical characteristics in atomic physics and also their exact numerical values, e.g., the average oscillator strengths [Formula: see text] and the line intensities J(nl, El'), etc., as n ≤ 4, l'= l ± 1 and 0 ≤ E ≤ 1 (see Tables 1–3). Besides, diagrams of certain radial functions for the discrete-continuous transitions are given here.

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