Hyperfine structure of low-lying vibrational levels in the B electronic state of molecular iodine

1989 ◽  
Vol 6 (9) ◽  
pp. 1656 ◽  
Author(s):  
A. Morinaga ◽  
J. Helmcke ◽  
K. Sugiyama ◽  
N. Ito
Keyword(s):  
Hyperfine Structure ◽  
Electronic State ◽  
Molecular Iodine ◽  
Vibrational Levels

Hyperfine structure of molecular-iodine absorption spectroscopy at 561nm

CPEM 2010 ◽  
2010 ◽  
Author(s):  
Tao Yang ◽  
Jianping Cao ◽  
Ye Li ◽  
Zhanjun Fang ◽  
Chunqing Gao ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Absorption Spectroscopy ◽  
Molecular Iodine ◽  
Iodine Absorption

Analysis of auroral first negative bands

1987 ◽  
Vol 65 (9) ◽  
pp. 1119-1132 ◽  
Author(s):  
K. Henriksen ◽  
L. Veseth
Keyword(s):  
Electronic State ◽  
Least Squares Method ◽  
Rotational Temperature ◽  
Numerical Approach ◽  
Synthetic Spectrum ◽  
Particle Impact ◽  
Population Densities ◽  
Vibrational Levels ◽  
Rotational Part ◽  
E Region

An exact numerical approach is used to compute the rotational part of the line strengths (Hönl–London factors) for the [Formula: see text], [Formula: see text] transition (1NG bands). The computed Hönl–London factors enable a synthetic spectrum to be derived, which is then fitted as a final step to observed auroral [Formula: see text] 1NG bands by use of a least squares method. In this way we determine the population densities of the vibrational levels of the upper [Formula: see text] electronic state and, in addition, an average rotational temperature. Our results give clear evidence that the auroral [Formula: see text] 1NG bands are mainly generated by particle impact on neutral O2 molecules in their electronic and vibrational ground states, and that the bands are produced within the E region.

The 3300 Å band system of cyclobutanone

1969 ◽  
Vol 47 (11) ◽  
pp. 1235-1236 ◽  
Author(s):  
D. C. Moule
Keyword(s):  
High Resolution ◽  
Electronic State ◽  
Potential Function ◽  
Band System ◽  
Ultraviolet Spectrum ◽  
Vibrational Levels ◽  
Minimum Potential

The ultraviolet spectrum of cyclobutanone vapor has been recorded under conditions of high resolution. The oxygen wagging vibrational levels have been found to be strongly anharmonic in the 1A2 electronic state and have been fitted to a double minimum potential function.

scholarly journals Frequency-modulation saturation spectroscopy of molecular iodine hyperfine structure near 640 nm with a diode laser source

2010 ◽  
Author(s):  
V. M. Khodakovskiy ◽  
V. I. Romanenko ◽  
I. V. Matsnev ◽  
R. A. Malitskiy ◽  
A. M. Negriyko ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Diode Laser ◽  
Frequency Modulation ◽  
Molecular Iodine ◽  
Laser Source ◽  
Saturation Spectroscopy

scholarly journals Sunlight-Initiated Photochemistry: Excited Vibrational States of Atmospheric Chromophores

2008 ◽  
Vol 2008 ◽  
pp. 1-13 ◽  
Author(s):  
Veronica Vaida ◽  
Karl J. Feierabend ◽  
Nabilah Rontu ◽  
Kaito Takahashi
Keyword(s):  
Solar Radiation ◽  
Electronic State ◽  
Chemical Bond ◽  
Wavelength Range ◽  
Chemical Reactions ◽  
Energy Barrier ◽  
Bond Energies ◽  
Vibrational States ◽  
Vibrational Levels ◽  
Combination Bands

Atmospheric chemical reactions are often initiated by ultraviolet (UV) solar radiation since absorption in that wavelength range coincides to typical chemical bond energies. In this review, we present an alternative process by which chemical reactions occur with the excitation of vibrational levels in the ground electronic state by red solar photons. We focus on the O–H vibrational manifold which can be an atmospheric chromophore for driving vibrationally mediated overtone-induced chemical reactions. Experimental and theoretical O–H intensities of several carboxylic acids, alcohols, and peroxides are presented. The importance of combination bands in spectra at chemically relevant energies is examined in the context of atmospheric photochemistry. Candidate systems for overtone-initiated chemistry are provided, and their lowest energy barrier for reaction and the minimum quanta of O–H stretch required for reaction are calculated. We conclude with a discussion of the major pathways available for overtone-induced reactions in the atmosphere.

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