Spectroscopic Study of Gadolinium Energy Levels by Resonant Multi-Photon Ionization

2000 ◽  
pp. 607-610
Author(s):  
Jonghoon Yi ◽  
Jin Tae Kim ◽  
Huynmin Park ◽  
Jaemin Han ◽  
Yongjoo Rhee ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Energy Levels ◽  
Photon Ionization

scholarly journals Time-Resolved Spectroscopy of Q CYG

2004 ◽  
Vol 194 ◽  
pp. 237-237
Author(s):  
S. Kafka ◽  
C. Tappert ◽  
R. K. Honeycutt ◽  
A. Bianchini
Keyword(s):  
Spectroscopic Study ◽  
Ground State ◽  
Energy Levels ◽  
Low Density ◽  
Absorption Profile ◽  
Time Resolved ◽  
Long Period ◽  
Wind Event ◽  
Absorption Features ◽  
Different Parts

A time-resolved optical spectroscopic study of the long-period (P=10.08h) old nova Q Cyg has revealed persistent yet erratic absorption features indicating the presence of a wind, while the system was rising to one of its stunded outbursts. Data taken with the WIYN 3.5m telescope show P Cygni profiles in the He I triplet lines at 5876Å and 7065Å, which are absent in the He I singlet emission line at 6678Å, despite the fact that the relevant energy levels of those three lines are at very similar excitation levels. The Hα line often has a red ward emission tail, characteristic of a receding outflow, and it possess a blueward absorption profile during only one wind event. Kafka et al. (2003) argued that this behavior is due to the strongly metastable 2 3S effective ground state of the He I triplets, which becomes over-populated in conditions of low density and a dilute radiation field, over-populating in turn the 23P common lower level of He I 5876Å and 7065Å, leading to absorption from a low density wind. Therefore, the triplet/singlet lines trace two different parts of the system: the wind and the disk respectively.

PHOTOCURRENT ABSORPTION SPECTROSCOPIC STUDY OF Si0.6Ge0.4/Si QUANTUM WELLS

2006 ◽  
Vol 20 (02) ◽  
pp. 133-140
Author(s):  
SHIHUA HUANG ◽  
FENGMIN WU ◽  
JI LIN ◽  
FANG LU
Keyword(s):  
Energy Level ◽  
Spectroscopic Study ◽  
Quantum Wells ◽  
Valence Band ◽  
Ground State ◽  
State Energy ◽  
Energy Levels ◽  
Absorption Coefficients ◽  
Discrete Energy ◽  
Discrete Energy Level

Absorption spectra of Si 0.6 Ge 0.4/ Si quantum wells are characterized by photocurrent measurements. The absorption coefficients of two different transitions, namely the transition between the Si band states and the discrete energy level in quantum wells, and the interlevel transition in quantum wells are deduced. They are directly proportional to (ℏω-ΔE)3/2 and δ(ℏω-Eeh), respectively. The valence band offsets of Si 0.6 Ge 0.4/ Si interface are 297 meV. The ground state energy levels in valence band and conduction band Si 0.6 Ge 0.4/ Si quantum wells are 37 meV and 23 meV, respectively.

scholarly journals SPECTROSCOPIC STUDY OF ThCl+ BY TWO-PHOTON IONIZATION

2016 ◽  
Author(s):  
Joshua Bartlett ◽  
Kirk Peterson ◽  
Michael Heaven ◽  
Robert VanGundy
Keyword(s):  
Spectroscopic Study ◽  
Two Photon ◽  
Photon Ionization

Spectroscopic properties and location of the Tb3+ and Eu3+ energy levels in Y2O2S under high hydrostatic pressure

2016 ◽  
Vol 18 (32) ◽  
pp. 22266-22275 ◽  
Author(s):  
M. Behrendt ◽  
S. Mahlik ◽  
K. Szczodrowski ◽  
B. Kukliński ◽  
M. Grinberg
Keyword(s):  
Hydrostatic Pressure ◽  
Spectroscopic Study ◽  
High Hydrostatic Pressure ◽  
Energy Levels ◽  
Spectroscopic Properties

In this contribution, an extensive spectroscopic study of Y2O2S doped with Eu3+ and Tb3+ is presented.

A Spectroscopic Study of Nicotine Analogue 2-Phenylpyrrolidine (PPD) Using Resonant Two-Photon Ionization (R2PI), Microwave, and 2D NMR Techniques

2009 ◽  
Vol 131 (7) ◽  
pp. 2638-2646 ◽  
Author(s):  
Danielle E. Martin ◽  
Evan G. Robertson ◽  
Jonathan G. MacLellan ◽  
Peter D. Godfrey ◽  
Christopher D. Thompson ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
2D Nmr ◽  
Two Photon ◽  
Nmr Techniques ◽  
Photon Ionization

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

A Perturbation Theory for the Population of Atomic Energy Levels in Non-Lte Plasmas

1988 ◽  
Vol 102 ◽  
pp. 343-347
Author(s):  
M. Klapisch
Keyword(s):  
Perturbation Theory ◽  
Small Parameter ◽  
Classification Scheme ◽  
Sum Rules ◽  
Energy Levels ◽  
Natural Classification ◽  
Quantum Numbers ◽  
Formal Expansion ◽  
Atomic Energy Levels ◽  
As Effects

AbstractA formal expansion of the CRM in powers of a small parameter is presented. The terms of the expansion are products of matrices. Inverses are interpreted as effects of cascades.It will be shown that this allows for the separation of the different contributions to the populations, thus providing a natural classification scheme for processes involving atoms in plasmas. Sum rules can be formulated, allowing the population of the levels, in some simple cases, to be related in a transparent way to the quantum numbers.

Low-lying energy levels of the FeH molecule

1999 ◽  
Vol 97 (1) ◽  
pp. 93-103 ◽  
Author(s):  
DANIEL F. HULLAH, RICHARD F. BARROW, JOHN
Keyword(s):  
Energy Levels
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