The Thermal Emission of Iodine

1974 ◽  
Vol 52 (19) ◽  
pp. 1862-1871
Author(s):  
J. David Brown ◽  
George Burns
Keyword(s):  
Experimental Data ◽  
Shock Wave ◽  
Temperature Dependence ◽  
Electronic State ◽  
Reasonable Agreement ◽  
Thermal Emission ◽  
Electronic States ◽  
Excited Electronic States ◽  
Calculated Temperature ◽  
Calculated Temperature Dependence

The temperature dependence of emission from iodine, heated in a shock wave to 1000 K–2000 K, has been measured at 4550, 5550, 6950, 7550, and 7820 Å. Preliminary measurements of the emission at 6380 Å were also made. The temperature dependence of the emission was calculated at these wavelengths for transitions to the ground electronic state X(1Σg+) of iodine from the excited electronic states, A(3Π1u), (1Π1u), and [Formula: see text]. The calculated results are in a reasonable agreement with experimental data. For the banded emission due to the B → X transition, a theory of the temperature dependence of emission was developed. At 6950, 7550, and 7820 Å, the results of this theory agree with the experimental data thus identifying the B → X transition as the source of emission at these wavelengths. The temperature dependence of emission at 4550 Å is consistent with calculated temperature dependence for either (1Π1u) → X or [Formula: see text] transitions. The temperature dependence of the emission at 5550 Å is consistent with calculated temperature dependence for the above two transitions, as well as for the A(3Π1u) → X transition.

The excited electronic states of the NO+ ion

1968 ◽  
Vol 46 (15) ◽  
pp. 1691-1695 ◽  
Author(s):  
K. P. Huber
Keyword(s):  
Electronic State ◽  
Photoelectron Spectrum ◽  
Electronic States ◽  
Corresponding States ◽  
Rydberg Series ◽  
Excited Electronic States ◽  
Absorption Bands ◽  
Close Analogy ◽  
New Interpretation

The photoelectron spectrum of NO (Turner and May 1966) is given a new interpretation in terms of electronic states of NO+ belonging to configurations … (5σ)2(1π)32π and … 5σ(1π)42π. The close analogy with corresponding states of N2 and CO is pointed out. The long-known β Rydberg series of absorption bands of NO is shown to converge towards … 5σ(1π)42π, 3Π, but no evidence can be found for the existence of an electronic state of NO+ at the limit of the α series. The previously assumed Rydberg character of this series appears to be erroneous.

Relative rates of reaction of olefins with the ground and the first excited electronic states of methylene

1967 ◽  
Vol 45 (6) ◽  
pp. 665-673 ◽  
Author(s):  
S. Krzyzanowski ◽  
R. J. Cvetanović
Keyword(s):  
Electronic State ◽  
Ground State ◽  
Room Temperature ◽  
Excited Electronic State ◽  
Electronic States ◽  
Excited Electronic States

Relative rates of reaction of a number of olefins with the ground state triplet and the first excited electronic state (the lowest singlet) of methylene have been determined at room temperature. The rates depend relatively little on olefin structure. Triplet methylene is somewhat more discriminating and, in particular, reacts considerably more rapidly with 1,3-butadiene than with monoolefins.

Calculations on the rate of photodissociation of hexafluoroacetone

1968 ◽  
Vol 46 (2) ◽  
pp. 307-310 ◽  
Author(s):  
P. G. Bowers
Keyword(s):  
Temperature Dependence ◽  
Singlet State ◽  
Excited Singlet State ◽  
Kcal Mole ◽  
Excited Singlet ◽  
Calculated Temperature ◽  
Experimental Variation ◽  
Vibrational Levels ◽  
Calculated Temperature Dependence

The dissociation of hexafluoroacetone from high vibrational levels of its first excited singlet state is treated by the methods of RRKM unimolecular theory. Predictions of the relative photodissociation rates for various exciting wavelengths are in reasonable accord with the observed rates and indicate a critical predissociation energy of about 6 kcal/mole. The calculated temperature dependence is less satisfactory and somewhat lower than the experimental variation.

Optical Properties and Dynamics of Molecular Excitons in Oligothiophenes

1995 ◽  
Vol 413 ◽  
Author(s):  
R. Tubino ◽  
G. Bongiovanni ◽  
A. Mura ◽  
R. Bosisio ◽  
C. Botfa ◽  
...  
Keyword(s):  
Experimental Data ◽  
Optical Properties ◽  
Solid State ◽  
Inclusion Compound ◽  
Electronic States ◽  
Emission Spectra ◽  
Excited Electronic States ◽  
Exciton Model ◽  
Time Resolved ◽  
Molecular Excitons

ABSTRACTCW absorption and emission spectra as well as time-resolved photoemission dynamics have been employed to detect the evolution of the first excited electronic states and the associated spectroscopical changes in passing from the isolated molecules to the aggregated state in thiophene oligomers. To this end a novel form of inclusion compound in PHTP in which the molecules are electronically decoupled in the solid state has been studied, thus avoiding the complications associated with the change in conformation occurring upon dissolution. The experimental data are interpreted in terms of the molecular exciton model.

scholarly journals Unveiling the role of upper excited electronic states in the photochemistry and laser performance of anti-B18H22

2020 ◽  
Vol 8 (37) ◽  
pp. 12806-12818 ◽  
Author(s):  
Luis Cerdán ◽  
Antonio Francés-Monerris ◽  
Daniel Roca-Sanjuán ◽  
Jonathan Bould ◽  
Jiří Dolanský ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Electronic State ◽  
Theoretical Approach ◽  
Excited Electronic State ◽  
Electronic States ◽  
Excited Electronic States ◽  
Laser Performance ◽  
Highly Efficient

Using the first laser borane, anti-B18H22, as a case study, our combined experimental and theoretical approach unravels the photophyscial and photochemical molecular dynamics of a highly efficient luminophore in an excited electronic state.

TEMPERATURE DEPENDENCE BEHAVIOR OF ELECTRICAL RESISTIVITY IN NOBLE METALS AT LOW TEMPERATURES

2014 ◽  
Vol 5 (3) ◽  
pp. 982-992 ◽  
Author(s):  
M AL-Jalali
Keyword(s):  
Experimental Data ◽  
Electrical Resistivity ◽  
Temperature Dependence ◽  
Concentration Dependence ◽  
Low Temperatures ◽  
Noble Metals ◽  
Phonon Scattering ◽  
Theoretical Models ◽  
Residual Resistivity ◽  
Electron Phonon Scattering

Resistivity temperature – dependence and residual resistivity concentration-dependence in pure noble metals(Cu, Ag, Au) have been studied at low temperatures. Dominations of electron – dislocation and impurity, electron-electron, and electron-phonon scattering were analyzed, contribution of these mechanisms to resistivity were discussed, taking into consideration existing theoretical models and available experimental data, where some new results and ideas were investigated.

Sign in / Sign up

Export Citation Format

Share Document