Determination of Radiative Lifetime of Vibrationally Excited sec‐Butyl Radicals Using Methylamine as a Model

1965 ◽  
Vol 42 (7) ◽  
pp. 2627-2628
Author(s):  
G. T. Tiedeman ◽  
R. B. Ingalls ◽  
Jack S. Margolis
Keyword(s):  
Radiative Lifetime ◽  
Vibrationally Excited

Determination of a High Potential Barrier Hindering Internal Rotation in 2-Methylcyclopentanone and α-Methyl-γ-Butyrolactone by Microwave Fourier Transform Spectroscopy

1992 ◽  
Vol 47 (6) ◽  
pp. 761-764 ◽  
Author(s):  
J. L. Alonso ◽  
N. Heineking ◽  
H. Dreizler ◽  
N. Heineking ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Internal Rotation ◽  
Excited States ◽  
Fourier Transform Spectroscopy ◽  
Vibrationally Excited ◽  
Methyl Group ◽  
Internal Rotation Barrier ◽  
High Potential Barrier ◽  
Method Analysis

AbstractThe microwave spectra of α-methyl-γ-butyrolactone and 2-methylcyclopentanone have been reinvestigated using microwave Fourier transform spectroscopy. A-E splittings due to internal rotation of the methyl group have been observed in the ground and several vibrationally excited states for both molecules. From an internal-axis-method analysis of these splittings, values of the methyl group internal rotation barrier of 2.61 kcal mol-1 for α-methyl-γ-butyrolactone and 2.41 kcal mol-1 for 2-methylcyclopentanone have been obtained.

Theoretical determination of the radiative lifetime of theA 2Σ+state of OH

1987 ◽  
Vol 87 (8) ◽  
pp. 4665-4672 ◽  
Author(s):  
Charles W. Bauschlicher ◽  
Stephen R. Langhoff
Keyword(s):  
Radiative Lifetime ◽  
Theoretical Determination

Radiative lifetime of vibrationally excited N2H+ and N2D+ molecular ions

2003 ◽  
Vol 223-224 ◽  
pp. 669-678 ◽  
Author(s):  
M Heninger ◽  
D Lauvergnat ◽  
J Lemaire ◽  
P Boissel ◽  
G Mauclaire ◽  
...  
Keyword(s):  
Radiative Lifetime ◽  
Molecular Ions ◽  
Vibrationally Excited

scholarly journals Anomalous electron density events in the quiet summer ionosphere at solar minimum over Millstone Hill

1998 ◽  
Vol 16 (4) ◽  
pp. 460-469 ◽  
Author(s):  
A. V. Pavlo ◽  
M. J. Buonsanto
Keyword(s):  
Solar Minimum ◽  
Reduction Process ◽  
Radar Data ◽  
Molecular Ions ◽  
Ion Chemistry ◽  
Vibrationally Excited ◽  
F Region ◽  
Ion Chemistry And Composition ◽  
Density Results

Abstract. This study compares the observed behavior of the F region ionosphere over Millstone Hill with calculations from the IZMIRAN model for solar minimum for the geomagnetically quiet period 23-25 June 1986, when anomalously low values of hmF2(<200 km) were observed. We found that these low values of hmF2 (seen as a G condition on ionograms) exist in the ionosphere due to a decrease of production rates of oxygen ions resulting from low values of atomic oxygen density. Results show that determination of a G condition using incoherent scatter radar data is sensitive both to the true concentration of O+ relative to the molecular ions, and to the ion composition model assumed in the data reduction process. The increase in the O++ N 2 loss rate due to vibrationally excited N2 produces a reduction in NmF2 of typically 5-10% , but as large as 15% , bringing the model and data into better agreement. The effect of vibrationally excited NO+ ions on electron densities is negligible.Key words. Ionosphere (Ion chemistry and composition; Ionosphere-atmosphere interactions; Mid-latitude ionosphere).

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