scholarly journals Внутридоплеровские резонансы, обусловленные фотоионизацией атомов в тонких газовых ячейках

2022 ◽  
Vol 130 (3) ◽  
pp. 353
Author(s):  
А.Ч. Измайлов
Keyword(s):  
High Resolution ◽  
Cross Section ◽  
Optical Pumping ◽  
Photoionization Cross Section ◽  
High Accuracy ◽  
High Resolution Spectroscopy ◽  
Atoms And Molecules ◽  
Optical Resonances ◽  
A Cell ◽  
Ionization Processes

By analogy with the well-tested method of high-resolution spectroscopy in thin gas cells for the processes of optical pumping of atoms, this work shows the possibility of detecting narrow sub-Doppler optical resonances caused directly by straight photoionization of atoms (or molecules) in such cells. The structure of the established nontrivial resonances substantially depends on the probability of photoionization of atoms and dimensions of such a cell, the internal thickness of which is many times smaller than its diameter. Of particular interest is the broadening of the considered sub-Doppler resonances, which is determined directly by the photoionization cross section of atoms and the intensity of radiation causing ionization. Under certain conditions, such photoionization broadening can be measured experimentally with high accuracy, as a result of which it is possible to obtain new important information about ionization processes in atoms and molecules.

scholarly journals Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV)

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 27
Author(s):  
Jean-Paul Mosnier ◽  
Eugene T. Kennedy ◽  
Jean-Marc Bizau ◽  
Denis Cubaynes ◽  
Ségolène Guilbaud ◽  
...  
Keyword(s):  
High Resolution ◽  
Cross Section ◽  
Cross Sections ◽  
Experimental Studies ◽  
Photoionization Cross Section ◽  
Theoretical Work ◽  
Rydberg Series ◽  
R Matrix ◽  
Resonance Strengths ◽  
Nitrogen Ion

High-resolution K-shell photoionization cross-sections for the C-like atomic nitrogen ion (N+) are reported in the 398 eV (31.15 Å) to 450 eV (27.55 Å) energy (wavelength) range. The results were obtained from absolute ion-yield measurements using the SOLEIL synchrotron radiation facility for spectral bandpasses of 65 meV or 250 meV. In the photon energy region 398–403 eV, 1s⟶2p autoionizing resonance states dominated the cross section spectrum. Analyses of the experimental profiles yielded resonance strengths and Auger widths. In the 415–440 eV photon region 1s⟶(1s2s22p2 4P)np and 1s⟶(1s2s22p2 2P)np resonances forming well-developed Rydberg series up n=7 and n=8 , respectively, were identified in both the single and double ionization spectra. Theoretical photoionization cross-section calculations, performed using the R-matrix plus pseudo-states (RMPS) method and the multiconfiguration Dirac-Fock (MCDF) approach were bench marked against these high-resolution experimental results. Comparison of the state-of-the-art theoretical work with the experimental studies allowed the identification of new resonance features. Resonance strengths, energies and Auger widths (where available) are compared quantitatively with the theoretical values. Contributions from excited metastable states of the N+ ions were carefully considered throughout.

scholarly journals Generation of tunable narrow bandwidth nanosecond pulses in the deep ultraviolet for efficient optical pumping and high resolution spectroscopy

2010 ◽  
Vol 81 (6) ◽  
pp. 063106 ◽  
Author(s):  
Luis Velarde ◽  
Daniel P. Engelhart ◽  
Daniel Matsiev ◽  
Jerry LaRue ◽  
Daniel J. Auerbach ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Pumping ◽  
High Resolution Spectroscopy ◽  
Nanosecond Pulses ◽  
Narrow Bandwidth ◽  
Deep Ultraviolet

scholarly journals Absolute high-resolution Se+photoionization cross-section measurements with Rydberg-series analysis

2011 ◽  
Vol 84 (1) ◽  
Author(s):  
D. A. Esteves ◽  
R. C. Bilodeau ◽  
N. C. Sterling ◽  
R. A. Phaneuf ◽  
A. L. D. Kilcoyne ◽  
...  
Keyword(s):  
High Resolution ◽  
Cross Section ◽  
Photoionization Cross Section ◽  
Rydberg Series ◽  
Series Analysis

scholarly journals A high resolution line list for AlO

2021 ◽  
Author(s):  
Charles A Bowesman ◽  
Meiyin Shuai ◽  
Sergei N Yurchenko ◽  
Jonathan Tennyson
Keyword(s):  
High Resolution ◽  
Spectroscopic Data ◽  
Vibrational Energy ◽  
Energy Levels ◽  
Laboratory Data ◽  
High Accuracy ◽  
High Resolution Spectroscopy ◽  
Line List ◽  
Vibrational Energy Levels

Abstract Indications of aluminium monoxide in atmospheres of exoplanets are being reported. Studies using high resolution spectroscopy should allow a strong detection but require high accuracy laboratory data. A Marvel (measured active rotational-vibrational energy levels) analysis is performed for the available spectroscopic data on 27Al16O: 22 473 validated transitions are used to determine 6 485 distinct energy levels. These empirical energy levels are used to provide an improved, spectroscopically accurate version of the ExoMol ATP line list for 27Al16O; at the same time the accuracy of the line lists for the isotopically-substituted species 26Al16O, 27Al17O and 27Al18O are improved by correcting levels in line with the corrections used for 27Al16O. These line lists are available from the ExoMol database at http://www.exomol.com.

A source of optical pumping for high-resolution spectroscopy based on a semiconductor laser

1984 ◽  
Vol 40 (1) ◽  
pp. 120-122
Author(s):  
L. A. Budkin ◽  
O. G. Okhotnikov ◽  
G. T. Pak ◽  
A. I. Pikhtelev ◽  
S. L. Puzanov
Keyword(s):  
High Resolution ◽  
Semiconductor Laser ◽  
Optical Pumping ◽  
High Resolution Spectroscopy

scholarly journals Photoionization Cross Sections of Carbon-Like N+ near the K-Edge (390 eV - 440 eV)

2021 ◽  
Author(s):  
Jean-Paul Mosnier ◽  
Eugene T Kennedy ◽  
Jean-Marc Bizau ◽  
Denis Cubaynes ◽  
Ségolène Guilbaud ◽  
...  
Keyword(s):  
High Resolution ◽  
Cross Section ◽  
Cross Sections ◽  
Experimental Studies ◽  
Photoionization Cross Section ◽  
Theoretical Work ◽  
Rydberg Series ◽  
R Matrix ◽  
Resonance Strengths ◽  
Nitrogen Ion

High-resolution K-shell photoionization cross-sections for the C-like atomic nitrogen ion (N+) are reported in the 398 eV (31.15 Å) to 450 eV (27.55 Å) energy (wavelength) range. The results were obtained from absolute ion-yield measurements using the SOLEIL synchrotron radiation facility for spectral bandpasses of 65 meV or 250 meV. In the photon energy region 398 eV - 403 eV, 1s⟶2p autoionizing resonance states dominated the cross section spectrum. Analyses of the experimental profiles yielded resonance strengths and Auger widths. In the 415 eV - 440 eV photon region 1s⟶1s2s22p2 4Pnp and 1s⟶1s2s22p2 2Pnp resonances forming well-developed Rydberg series up n=7 and n=8 , respectively, were identified in both the single and double ionization spectra. Theoretical photoionization cross-section calculations, performed using the R-matrix plus pseudo-states (RMPS) method and the multiconfiguration Dirac-Fock (MCDF) approach were bench marked against these high-resolution experimental results. Comparison of the state-of-the-art theoretical work with the experimental studies allowed the identification of new resonance features. Resonance strengths, energies and Auger widths (where available) are compared quantitatively with the theoretical values. Contributions from excited metastable states of the N+ ions were carefully considered throughout.

XUV Absorption Spectra of Carbon Ions

1988 ◽  
Vol 102 ◽  
pp. 71-73
Author(s):  
E. Jannitti ◽  
P. Nicolosi ◽  
G. Tondello
Keyword(s):  
Absorption Spectra ◽  
Cross Section ◽  
Theoretical Calculations ◽  
Photoionization Cross Section ◽  
Carbon Ions

AbstractThe photoabsorption spectra of the carbon ions have been obtained by using two laser-produced plasmas. The photoionization cross-section of the CV has been absolutely measured and the value at threshold, σ=(4.7±0.5) × 10−19cm2, as well as its behaviour at higher energies agrees quite well with the theoretical calculations.

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