The oscillator strength of the 4.23 eV absorption band in NaI(Tl)-crystals

1966 ◽  
Vol 192 (3) ◽  
pp. 299-304 ◽  
Author(s):  
H. Leutz ◽  
G. Schulz
Keyword(s):  
Absorption Band ◽  
Oscillator Strength

Oscillator strength of the long-wave absorption band and inhibition activity of some hydrogenated quinolines

1967 ◽  
Vol 6 (4) ◽  
pp. 360-362
Author(s):  
R. P. Vorob'eva ◽  
L. P. Zalukaev ◽  
E. N. Ivanova
Keyword(s):  
Absorption Band ◽  
Oscillator Strength ◽  
Inhibition Activity ◽  
Wave Absorption ◽  
Long Wave

Complexing between palladium(II) halides and p-NOC6H4NMe2 and p-NOC6H4NEt2

1969 ◽  
Vol 47 (16) ◽  
pp. 3075-3077 ◽  
Author(s):  
I. Batten ◽  
K. E. Johnson
Keyword(s):  
Absorption Band ◽  
Oscillator Strength ◽  
Organic Ligand ◽  
Band Position ◽  
Visible Spectra ◽  
Infrared Data

The complexes PdL2X2 (L = p-nitrosodimethylaniline, p-nitrosodiethylaniline; X = Cl, Br, I) have been prepared. The principal absorption band in the visible spectra of the complexes has been identified as a π–π* transition centered primarily on the ligands on the basis of its high oscillator strength, the similarity of the latter to that of the free organic ligand, and the insensitivity of the band position to the nature of the halide. Infrared data indicate that palladium is bonded through the NO group.

Das kinetische Verhalten von Benzylradikalen und die Oszillatorenstärke ihres Emissionsspektrums in einer Niederdruckentladung

1966 ◽  
Vol 21 (9) ◽  
pp. 1394-1399
Author(s):  
M. Kempfle ◽  
M. Stockburger
Keyword(s):  
Absorption Band ◽  
Oscillator Strength ◽  
Repetition Rate ◽  
Pulse Width ◽  
Theoretical Calculations ◽  
Concentration Quenching ◽  
Recombination Coefficient ◽  
Pressure Discharge ◽  
Benzyl Radicals ◽  
Increasing Temperature

Benzyl radicals are formed from toluene in a low pressure discharge. The discharge is operated with rectangular pulses (pulse width 5 -200 μsec, repetition rate 200 cps, amplitude 50 -700 mA). The disappearance of the radicals is measured by means of their absorption band at 3053 A. Under the conditions of the discharge the „lifetime“ of the radicals is about 10-3 sec. The results show, that they disappear due to recombination in the gasphase via two-body-collisions. The recombination coefficient decreases with increasing temperature. - The corrected lifetime of the emission of the benzyl radicals (elimination of concentration quenching) is 10-4 sec at 25°C. The oscillator strength, which is calculated from this value, is compared with theoretical calculations. The measured lifetime of the emission of several radicals, whose chemicals constitution is not yet known, lies between 10-5 and 10-4 sec.

scholarly journals Visual Pigments of Goldfish Cones

1974 ◽  
Vol 63 (3) ◽  
pp. 279-304 ◽  
Author(s):  
Ferenc I. Hárosi ◽  
Edward F. MacNichol
Keyword(s):  
Absorption Band ◽  
Oscillator Strength ◽  
Optical Density ◽  
Visual Pigment ◽  
Visual Pigments ◽  
Main Absorption Band ◽  
Dichroic Ratio ◽  
Outer Segments ◽  
Retinal Photoreceptors ◽  
Cone Pigments

Freshly isolated retinal photoreceptors of goldfish were studied microspectrophotometrically. Absolute absorptance spectra obtained from dark-adapted cone outer segments reaffirm the existence of three spectrally distinct cone types with absorption maxima at 455 ± 3,530 ± 3, and 625 ± 5 nm. These types were found often recognizable by gross cellular morphology. Side-illuminated cone outer segments were dichroic. The measured dichroic ratio for the main absorption band of each type was 2–3:1. Rapidly bleached cells revealed spectral and dichroic transitions in regions near 400–410, 435–455, and 350–360 nm. These photoproducts decay about fivefold as fast as the intermediates in frog rods. The spectral maxima of photoproducts, combined with other evidence, indicate that retinene2 is the chromophore of all three cone pigments. The average specific optical density for goldfish cone outer segments was found to be 0.0124 ± 0.0015/µm. The spectra of the blue-, and green-absorbing cones appeared to match porphyropsin standards with half-band width Δν = 4,832 ± 100 cm–1. The red-absorbing spectrum was found narrower, having Δν = 3,625 ± 100 cm–1. The results are consistent with the notion that visual pigment concentration within the outer segments is about the same for frog rods and goldfish cones, but that the blue-, and green-absorbing pigments possess molar extinctions of 30,000 liter/mol cm. The red-absorbing pigment was found to have extinction of 40,000 liter/mol cm, assuming invariance of oscillator strength among the three cone spectra.

BOUND SMALL POLARONS IN HIGH-Tc SUPERCONDUCTORS

1990 ◽  
Vol 04 (07n08) ◽  
pp. 1369-1378 ◽  
Author(s):  
H. SZYMCZAK ◽  
L. GENZEL ◽  
A. WITTLIN
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Oscillator Strength ◽  
Optical Phonons ◽  
High Tc Superconductors ◽  
High Tc ◽  
Optical Absorption Band ◽  
Small Polarons

The thermal and acoustic anomalies in high-Tc superconductors are interpreted in terms of contributions arising from the tunneling motion of bound small polarons. The small polarons arise in YBa 2 Cu 3 O 7 oxides due to the localization of the holes on one of the four O 2− ions surrounding the Cu(2) site in the CuO2 plane. The optical absorption band located at 0.4 eV is explained as a light-induced transfer of holes between the equivalent O 2− sites. It is argued that the strong hole-lattice interaction is responsible for the enhanced oscillator strength of optical phonons in YBa 2 Cu 3 O 7.

Oscillator Strength of Absorption Band in Dye Molecules

1958 ◽  
Vol 29 (4) ◽  
pp. 958-959 ◽  
Author(s):  
Hans Kuhn
Keyword(s):  
Absorption Band ◽  
Oscillator Strength ◽  
Dye Molecules

Oscillator Strength of I--Absorption Band in KCl Crystal

1961 ◽  
Vol 16 (8) ◽  
pp. 1640-1640 ◽  
Author(s):  
Takehiko Ishii
Keyword(s):  
Absorption Band ◽  
Oscillator Strength

scholarly journals The main optical characteristics of UV-spectra of 5-(adamantane-1-yl)-4R-1,2,4-triazole-3-thiones derivatives

2018 ◽  
pp. 57-62
Author(s):  
V. M. Odyntsova
Keyword(s):  
Matrix Element ◽  
Absorption Band ◽  
Oscillator Strength ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Elemental Analysis ◽  
Electronic Absorption Spectra ◽  
Uv Spectra ◽  
Optical Characteristics ◽  
Absorption Bands

The development of pharmaceutical chemistry confronts molecular spectroscopy the problem of calculating the electronic states, assumptions and explanations of the various properties of complex organic compounds. In recent years, following the basic optical characteristics of the electronic absorption spectra: the wave number of maximum absorption – νmax (in cm-1), the half-width of the absorption bands of – ∆ν1/2 (cm-1), the integral intensity of the absorption band (in l/mol·cm2), the oscillator strength of the electronic transition – f, the matrix element of the transition of electrons – Mik. began widely used. These constants allow you to determine the chromophores in the investigated substances, to establish the probability and the resolution of the electrons’ transition. Our goal was the calculation and study of the basic optical characteristics of the electronic absorption spectra of 5-(adamantane-1-yl)-4R-1,2,4-triazole-3-thione, namely 5-(adamantane-1-yl)-4-methyl-1,2,4-triazole-3-thione and 5-(adamantane-1-yl)-4-phenyl-1,2,4-triazole-3-thione derivatives. When deciding about the purity of the compounds we used melting point, thin layer chromatography and the results of elemental analysis. UV spectra of the investigated compounds was measured with a spectrophotometer Specord 200-222U214 (Germany). Elemental analyzer GmbH (Germany) was used for carrying out the elemental analysis. It is determined that the values of the half-width Δν½ and integrated intensity of the absorption bands (A), the oscillator strength (f) and matrix element of the transition (Mik) can be used as an important constants of 5-(adamantane-1-yl)-4R-1,2,4-triazole-3-thione derivatives for their identification and establishing a deep connection between spectra and structure of the molecule. For the studied compounds is the most characteristic absorption band in the medium wave spectrum with high values of A and f, which indicate about the permitted and probable transitions of electrons which give rise to the observed maxima. Based on the study of the basic optical characteristics of the electronic absorption spectra of 5-(adamantane-1-yl)-4R-1,2,4-triazole-3-thione derivatives is found that chromatofor in the studied molecules is the structure of 1,2,4-triazole and substituents (adamantane, methyl and phenyl radicals). A distinctive feature, namely 5-(adamantane-1-yl)-4-phenyl-1,2,4-triazole-3-thione 5-(adamantane-1-yl)-4-methyl-1,2,4-triazole-3-tion are the values A, f, Mik, which can be used to identify the investigated compounds.

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