The fundamental absorption band of amorphous germanium

1969 ◽  
Vol 19 (10) ◽  
pp. 1246-1254 ◽  
Author(s):  
J. Tauc ◽  
A. Abrahám
Keyword(s):  
Absorption Band ◽  
Amorphous Germanium ◽  
Fundamental Absorption Band

Fundamental Absorption Band of HD

1974 ◽  
Vol 52 (17) ◽  
pp. 1669-1671 ◽  
Author(s):  
J. Bejar ◽  
H. P. Gush
Keyword(s):  
Dipole Moment ◽  
Absorption Band ◽  
Line Width ◽  
Doppler Effect ◽  
Transition Dipole Moment ◽  
Vibration Band ◽  
Transition Dipole ◽  
Fundamental Absorption Band ◽  
The Doppler Effect

The fundamental rotation–vibration band of HD has been resolved in the gas at 1 atm pressure. The line width appears to be totally due to the Doppler effect and equals 0.026 cm−1. The transition dipole moment has been calculated from the intensities of lines in the R branch: it is found to vary from 4 × 10−5 D for J = 0 to 7 × 10−5 for J = 4.

scholarly journals Pressure Effects on the Optical Properties of NdVO4

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 237 ◽  
Author(s):  
Enrico Bandiello ◽  
Josu Sánchez-Martín ◽  
Daniel Errandonea ◽  
Marco Bettinelli
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Absorption Band ◽  
Phase Change ◽  
Band Gap ◽  
Pressure Dependence ◽  
Structural Changes ◽  
Pressure Effects ◽  
Absorption Bands ◽  
Fundamental Absorption Band

We report on optical spectroscopic measurements in pure NdVO4 crystals at pressures up to 12 GPa. The influence of pressure on the fundamental absorption band gap and Nd3+ absorption bands has been correlated with structural changes in the crystal. The experiments indicate that a phase transition takes place between 4.7 and 5.4 GPa. We have also determined the pressure dependence of the band-gap and discussed the behavior of the Nd3+ absorption lines under compression. Important changes in the optical properties of NdVO4 occur at the phase transition, which, according to Raman measurements, corresponds to a zircon to monazite phase change. In particular, in these conditions a collapse of the band gap occurs, changing the color of the crystal. The changes are not reversible. The results are analyzed in comparison with those deriving from previous studies on NdVO4 and related vanadates.

Investigation of avalanche photocurrent at the edge of fundamental absorption band in Schottky diodes

1985 ◽  
Vol 28 (12) ◽  
pp. 1022-1025
Author(s):  
A. K. Babak ◽  
S. S. Kil'chitskaya ◽  
V. I. Strikha ◽  
V. A. Afanas'ev ◽  
A. V. Ievskii ◽  
...  
Keyword(s):  
Absorption Band ◽  
Schottky Diodes ◽  
Fundamental Absorption Band

scholarly journals Measurement of non-linear optical coefficients of chalcogenide glasses near the fundamental absorption band edge

2018 ◽  
Vol 480 ◽  
pp. 13-17 ◽  
Author(s):  
Elena Romanova ◽  
Yulia Kuzyutkina ◽  
Vladimir Shiryaev ◽  
Nabil Abdel-Moneim ◽  
David Furniss ◽  
...  
Keyword(s):  
Absorption Band ◽  
Chalcogenide Glasses ◽  
Band Edge ◽  
Absorption Band Edge ◽  
Fundamental Absorption Band ◽  
Non Linear ◽  
Linear Optical

scholarly journals Оптическая спектроскопия и сверхпроводимость купратов (О б з о р)

2019 ◽  
Vol 61 (5) ◽  
pp. 809
Author(s):  
А.С. Москвин
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
High Temperature ◽  
Absorption Band ◽  
High Temperature Superconductors ◽  
Electron Hole ◽  
Electric Polarizability ◽  
Fundamental Absorption Band ◽  
Charge Transfer Transitions ◽  
Low Dimensional

AbstractThe optical properties of low-dimensional dielectric cuprates, including parent systems for high-temperature superconductors, such as La_2CuO_4, Sr_2CuO_2Cl_2, and YBa_2Cu_3O_6 are briefly reviewed. The main focus is on the d – d and p – d charge transfer transitions, which determine the fundamental absorption band. The analysis of optical properties shows the instability of parent cuprates against the d – d charge transfer with the formation of metastable electron–hole (EH) dimers of the Cu^1+–Cu^3+-type pairs coupled by the two-particle transfer and characterized by the giant electric polarizability. The formation of a system of stable EH dimers upon nonisovalent substitution determines the unconventional properties of the pseudogap and superconducting phases of doped cuprates.

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