Optical and Thermal Bleaching of Trapped Electrons in Aliphatic Amine Glasses

1972 ◽  
Vol 50 (16) ◽  
pp. 2699-2701 ◽  
Author(s):  
Shoji Noda ◽  
Kenji Fueki ◽  
Zen-ichiro Kuri
Keyword(s):  
Optical Absorption ◽  
Excited States ◽  
Line Width ◽  
Aliphatic Amine ◽  
Optical Transitions ◽  
Thermal Decay ◽  
Continuum State ◽  
Trapped Electrons ◽  
Thermal Bleaching ◽  
Optical Bleaching

An optical bleaching study has been made of trapped electrons in γ-irradiated aliphatic amines at −196 °C. The results indicate that the optical absorption of the trapped electrons in the amines is attributed to optical transitions to both bound excited states and a continuum state. The thermal decay of the trapped electrons has been studied by the e.s.r. technique at temperatures above −196 °C. It has been found that the line width of the e.s.r. spectra of the trapped electrons in some of the amines changes on warming.

OPTICAL ABSORPTION SPECTRA OF ARSENIC AND PHOSPHORUS IN SILICON

1962 ◽  
Vol 40 (10) ◽  
pp. 1480-1489 ◽  
Author(s):  
J. W. Bichard ◽  
J. C. Giles
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Excited States ◽  
Ground State ◽  
Absorption Lines ◽  
Full Width ◽  
Optical Absorption Spectra ◽  
Phosphorus Impurity ◽  
Line Widths ◽  
Phosphorus In Silicon

The optical absorption spectra of arsenic and phosphorus donor impurities in silicon have been studied under conditions of improved resolution. Absorption lines due to transitions from the impurity ground state to the excited states 2p0, 2p±, 3p0, 3p±, 4p0, 4 p±, and 5p0, and 5p± have been observed at 4.2° K. The relative intensities of some of these absorption lines are compared with existing experimental and theoretical estimates. The contribution of instrumental broadening to the observed line widths is assessed and natural line widths are estimated. The estimates indicate values for the natural line widths which are much less than those previously reported. For phosphorus impurity, the natural line widths are estimated to be less than 0.08 × 10−3 electron volts full width at half-maximum. The possibility of concentration broadening is discussed in connection with the arsenic data.

Optical Transitions in Chalcogenide Glasses From the Point of View of a Barrier-Cluster Model

2008 ◽  
Vol 39-40 ◽  
pp. 253-256
Author(s):  
Ivan Baník
Keyword(s):  
Optical Absorption ◽  
Low Temperatures ◽  
Cluster Model ◽  
Chalcogenide Glasses ◽  
Temperature Shift ◽  
Point Of View ◽  
Optical Transitions ◽  
Influence Of Temperature ◽  
Exponential Tails ◽  
Influence Of Temperature On

A barrier-cluster model of chalcogenide glasses is employed to analyze optical transitions near the absorption edge. The influence of temperature on the optical absorption is studied. The model is used to explain the temperature shift of exponential tails of the optical absorption and the temperature dependence of the optical forbidden-band width at low temperatures.

CRDS study of auto-ionizing Rydberg states of argon in a microwave discharge This article is part of a Special Issue on Spectroscopy at the University of New Brunswick in honour of Colan Linton and Ron Lees.

2009 ◽  
Vol 87 (5) ◽  
pp. 575-581 ◽  
Author(s):  
B. M. van der Ende ◽  
C. Winslade ◽  
R. L. Brooks ◽  
R. H. deLaat ◽  
N. P.C. Westwood
Keyword(s):  
New Brunswick ◽  
Excited States ◽  
Microwave Discharge ◽  
Rydberg States ◽  
Spectral Lines ◽  
Optical Transitions ◽  
Single Source ◽  
Special Issue ◽  
Line Widths ◽  
The University

Optical transitions from two microwave discharge excited states of argon have been observed using cavity ring-down spectroscopy. These transitions originate on the high-lying levels, 3d[1/2] 1° and 3d[3/2] 2° , and terminate on the nf ′[5/2] Rydberg (n = 8 to 22) levels, which, except for n = 8, lie between the 2P3/2 and 2P1/2 ionization thresholds. In total, 24 such spectral lines have been observed. The quantum defect for the f ′ series has been measured and is compared to previously measured values. We observe a nearly threefold jump in line width in going from n = 8 to n = 9, below and above the 2P3/2 threshold, respectively. The line widths are broad and increase monotonically with n (above 9), in contrast to the narrowing of line widths usually observed. We cannot attribute this to a single source but conclude that collisional, quasielastic l-mixing of the nf ′[5/2] Rydberg states plays a significant role.

scholarly journals Investigation of Light Absorption in a ZnS Quantum Dot

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Hojjatollah K. Salehani ◽  
Maedeh Zakeri
Keyword(s):  
Magnetic Field ◽  
Optical Absorption ◽  
Quantum Dot ◽  
Excited States ◽  
Light Absorption ◽  
Blue Shift ◽  
Optical Absorption Coefficient ◽  
Parabolic Confinement ◽  
Parabolic Confinement Potential ◽  
The Magnetic Field

The light absorption of a ZnS quantum dot with a parabolic confinement potential is studied in this paper in the presence of magnetic field perpendicular to dot plane. The Schrodinger equation of a single electron is solved numerically, and energy spectra and wave functions are obtained. Then, the optical absorption coefficients in transition from ground state to different excited states are calculated. The effects the magnetic field and quantum dot width on the optical absorption are investigated. It is found that the optical absorption coefficient has a blue shift by increasing of magnetic field or confinement strength of quantum dot.

scholarly journals Optical absorption properties of metal–organic frameworks: solid state versus molecular perspective

2020 ◽  
Vol 22 (35) ◽  
pp. 19512-19521
Author(s):  
Maria Fumanal ◽  
Clémence Corminboeuf ◽  
Berend Smit ◽  
Ivano Tavernelli
Keyword(s):  
Solid State ◽  
Optical Absorption ◽  
Excited States ◽  
Metal Organic Frameworks ◽  
Absorption Properties ◽  
Metal Organic ◽  
Molecular Computations

The challenges of the description of excited states in MOF crystals are addressed by periodic and molecular computations.

scholarly journals LARGE-SCALE FIRST PRINCIPLES CONFIGURATION INTERACTION CALCULATIONS OF OPTICAL ABSORPTION IN BORON CLUSTERS

Nano LIFE ◽  
2012 ◽  
Vol 02 (02) ◽  
pp. 1240004 ◽  
Author(s):  
RAVINDRA SHINDE ◽  
ALOK SHUKLA
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Excited States ◽  
Configuration Interaction ◽  
Large Scale ◽  
Body Wave ◽  
Basis Sets ◽  
Linear Absorption ◽  
Transition Dipole ◽  
Boron Clusters

We have performed systematic large-scale all-electron correlated calculations on boron clusters B n(n = 2 - 5), to study their linear optical absorption spectra. Several possible isomers of each cluster were considered, and their geometries were optimized at the coupled-cluster singles doubles (CCSD) level of theory. Using the optimized ground-state geometries, the excited states of different clusters were computed using the multi-reference singles-doubles configuration–interaction (MRSDCI) approach, which includes electron correlation effects at a sophisticated level. These CI wave functions were used to compute the transition dipole matrix elements connecting the ground and various excited states of different clusters, eventually leading to their linear absorption spectra. The convergence of our results with respect to the basis sets, and the size of the CI expansion were carefully examined. The contribution of configurations to many body wave-function of various excited states suggests that the excitations involved are collective, plasmonic type.

Excited states of trapped electrons in frozen polar media as studied by magnetic circular dichroism

1975 ◽  
Vol 35 (4) ◽  
pp. 461-464 ◽  
Author(s):  
Takeji Takui ◽  
Koichi Itoh ◽  
Yasuhiro Waka ◽  
Hajime Kawakami ◽  
Wasuke Mori
Keyword(s):  
Circular Dichroism ◽  
Excited States ◽  
Magnetic Circular Dichroism ◽  
Trapped Electrons ◽  
Polar Media ◽  
Circular Dichroïsm
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