Temperature dependence of isotropic Raman intramolecular vibrational band contour formation of some liquids. The computer research of methyl iodide

2002 ◽  
Author(s):  
V. D. Danchuk ◽  
A. P. Kravchuk
Keyword(s):  
Temperature Dependence ◽  
Methyl Iodide ◽  
Vibrational Band ◽  
Band Contour ◽  
Computer Research

High Temperature Absorption of the 3.39 µm He-Ne Laser Line by Small Hydrocarbons

1978 ◽  
Vol 32 (5) ◽  
pp. 489-493 ◽  
Author(s):  
D. B. Olson ◽  
W. G. Mallard ◽  
W. C. Gardiner
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Methyl Iodide ◽  
Transient Absorption ◽  
Broad Band ◽  
Laser Line ◽  
Methyl Radicals ◽  
Large Numbers ◽  
Absorbing States ◽  
No Absorption

Absorptivity measurements for the 3.39 µm He-Ne laser line are reported for methane, acetylene, ethylene, ethane, propane, n-butane, and n-pentane over the temperature range 300 < T < 2000°K. Shock-heated mixtures containing formaldehyde and methyl iodide showed no absorption or transient absorption at any temperature that could be attributed to formaldehyde or methyl radicals. The temperature dependence of the absorptivities of the C2 and higher hydrocarbons was much weaker than for methane. Comparison with simple theoretical expectations and broad-band absorptivities showed that the higher hydrocarbon absorptions include quite large numbers of absorbing states.

Studies in solvolysis. Part VIII. An entropy correlation related to the reaction of various nucleophiles with malachite green

1977 ◽  
Vol 55 (4) ◽  
pp. 686-692 ◽  
Author(s):  
Stephen Harvey Morris ◽  
John Marshall William Scott ◽  
Frederick Steele
Keyword(s):  
Temperature Dependence ◽  
Malachite Green ◽  
Methyl Iodide ◽  
Rate Constants ◽  
Transition States ◽  
Reaction Coordinate ◽  
Similar Correlation ◽  
Displacement Reactions

The entropies of activation related to the reactions of aqueous malachite green with the nucleophiles water, hydroxide, hydrazine, ammonia, hypochlorite, and sulphite have been calculated from the temperature dependence of the rate constants appropriate to these reactions. The entropies of the transition states for these reactions have been characterized and the transition states shown to be 'reactant like'. A similar correlation, based on data for a series of nucleophiles attacking methyl iodide, suggests that the transition states for the SN2 displacement reactions are also 'reactant like' with respect to the attacking nucleophile. A relationship between two distinct parameters each of which is related to the position of transition states along the reaction coordinate is considered.

Temperature Dependence of Nitrogen Broadening of the NO Fundamental Vibrational Band

1997 ◽  
Vol 181 (2) ◽  
pp. 307-315 ◽  
Author(s):  
M.N. Spencer ◽  
C. Chackerian ◽  
L.P. Giver ◽  
L.R. Brown
Keyword(s):  
Temperature Dependence ◽  
Vibrational Band

The temperature dependence of the methyl rotational potential in methyl iodide under pressure

1989 ◽  
Vol 75 (2) ◽  
pp. 217-221 ◽  
Author(s):  
M. Prager ◽  
C. Vettier ◽  
S. Mahling-Ennanoui
Keyword(s):  
Temperature Dependence ◽  
Methyl Iodide

scholarly journals Temperature Dependence of Raman-Active Modes of TlIn(0.95Se0.05)2 Single Crystals

2019 ◽  
Vol 64 (2) ◽  
pp. 173
Author(s):  
O. O. Gomonnai ◽  
M. Ludemann ◽  
A. V. Gomonnai ◽  
I. Yu. Roman ◽  
A. G. Slivka ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Phase Transformations ◽  
Single Crystals ◽  
Raman Spectra ◽  
Temperature Interval ◽  
Half Width ◽  
Vibrational Band ◽  
Temperature Behavior ◽  
Frequency Interval ◽  
Temperature Range

The unpolarized Raman spectra of TlIn(S0.95Se0.05)2 single crystals in the frequency interval 16–340 cm−1 are studied in the temperature interval 30 ≤ T ≤ 293 K. The Raman spectra are analyzed by a multipeak simulation using Lorentzian contours. The temperature behavior of the vibrational band parameters (half-width, intensity, and frequency) is studied with the emphasis on the temperature range, where changes related to phase transformations are revealed.

Infrared Spectroscopy in Supersonic Molecular Beams: ν3 Band of SF6 at 10.6 µm

1978 ◽  
Vol 32 (3) ◽  
pp. 287-289 ◽  
Author(s):  
K. C. Kim ◽  
R. F. Holland ◽  
H. Filip
Keyword(s):  
Infrared Spectroscopy ◽  
Temperature Dependence ◽  
Molecular Beams ◽  
Gas Mixtures ◽  
Absorption Feature ◽  
Contour Analysis ◽  
Temperature Probe ◽  
Supersonic Molecular Beams ◽  
Band Contour

A band contour analysis is shown for the ν3 absorption of the flow-cooled SF6. Temperature dependence of the absorption feature is simulated. The possible utility of this technique as a temperature probe of flow-cooled gas mixtures is discussed.

Temperature Dependence of the Critical Electron Dose for Fatty Acid Monolayers

1982 ◽  
Vol 40 ◽  
pp. 78-79
Author(s):  
Kenneth H. Downing ◽  
Robert M. Glaeser
Keyword(s):  
Electron Beam ◽  
Fatty Acid ◽  
Inelastic Scattering ◽  
Temperature Dependence ◽  
Structural Damage ◽  
Direct Result ◽  
Second Step ◽  
Strong Temperature Dependence ◽  
Electron Dose ◽  
Covalent Bonds

The structural damage of molecules irradiated by electrons is generally considered to occur in two steps. The direct result of inelastic scattering events is the disruption of covalent bonds. Following changes in bond structure, movement of the constituent atoms produces permanent distortions of the molecules. Since at least the second step should show a strong temperature dependence, it was to be expected that cooling a specimen should extend its lifetime in the electron beam. This result has been found in a large number of experiments, but the degree to which cooling the specimen enhances its resistance to radiation damage has been found to vary widely with specimen types.

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