Excited State Chemistry in the Stratosphere

1974 ◽  
Vol 52 (8) ◽  
pp. 1452-1464 ◽  
Author(s):  
R. J. Cvetanović
Keyword(s):  
Excited State ◽  
Excited States ◽  
Chemical Behavior ◽  
Molecular Fragments ◽  
Electronically Excited ◽  
Excited Oxygen ◽  
Oxygen Atoms

Potential involvement of excited states of molecules and molecular fragments in the chemistry of the stratosphere is discussed, with particular emphasis on the chemical behavior of electronically excited oxygen atoms.

scholarly journals Theoretical Electronic and Rovibrational Studies for Anions of Interest to the DIBs

2013 ◽  
Vol 9 (S297) ◽  
pp. 344-348 ◽  
Author(s):  
R. C. Fortenberry
Keyword(s):  
Excited State ◽  
Excited States ◽  
State Of The Art ◽  
Spectroscopic Constants ◽  
Coupled Cluster ◽  
Electronic Excitations ◽  
Electronically Excited States ◽  
Coupled Cluster Theory ◽  
Electronically Excited ◽  
Enolate Anion

AbstractThe dipole-bound excited state of the methylene nitrile anion (CH2CN−) has been suggested as a candidate carrier for a diffuse interstellar band (DIB) at 803.8 nm. Its corresponding radical has been detected in the interstellar medium (ISM), making the existence for the anion possible. This work applies state-of-the-art ab initio methods such as coupled cluster theory to reproduce accurately the electronic excitations for CH2CN− and the similar methylene enolate anion, CH2CHO−. This same approach has been employed to indicate that 19 other anions may possess electronically excited states, five of which are valence in nature. Concurrently, in order to assist in the detection of these anions in the ISM, work has also been directed towards predicting vibrational frequencies and spectroscopic constants for these anions through the use of quartic force fields (QFFs). Theoretical rovibrational work on anions has thus far included studies of CH2CN−, C3H−, and is currently ongoing for similar systems.

Collision Integrals for Interactions Between Oxygen Atoms and Ions in Electronically Excited States

2006 ◽  
Author(s):  
Annarita Laricchiuta ◽  
Mario Capitelli ◽  
Roberto Celiberto ◽  
Claudine Gorse ◽  
Domenico Bruno ◽  
...  
Keyword(s):  
Excited States ◽  
Collision Integrals ◽  
Electronically Excited States ◽  
Electronically Excited ◽  
Oxygen Atoms

Reactive scattering of ground-state and electronically excited oxygen atoms on a liquid hydrocarbon surface

1997 ◽  
Vol 108 ◽  
pp. 387-399 ◽  
Author(s):  
Donna J. Garton ◽  
Timothy K. Minton ◽  
Michele Alagia ◽  
Nadia Balucani ◽  
Piergiorgio Casavecchia ◽  
...  
Keyword(s):  
Ground State ◽  
Liquid Hydrocarbon ◽  
Reactive Scattering ◽  
Electronically Excited ◽  
Excited Oxygen ◽  
Oxygen Atoms

The collisional quenching of electronically excited oxygen atoms, O(21D2), by the gases NH3, H2O2, C2H6, C3H8, and C(CH3)4, using time-resolved attenuation of atomic resonance radiation

1976 ◽  
Vol 54 (11) ◽  
pp. 1765-1770 ◽  
Author(s):  
I. S. Fletcher ◽  
D. Husain
Keyword(s):  
Resonance Radiation ◽  
Recent Measurement ◽  
Absolute Rate ◽  
Collisional Quenching ◽  
Time Resolved ◽  
Excited Atoms ◽  
Electronically Excited ◽  
Hartley Band ◽  
Excited Oxygen ◽  
Oxygen Atoms

A kinetic study of electronically excited oxygen atoms, O(21D2), is presented. These optically metastable species were generated by repetitive pulsed irradiation in the Hartley-band continuum and monitored photoelectrically in absorption by time-resolved attenuation of resonance radiation at λ = 115.2 nm (O(31D20)←O(21D2). Absolute rate constants for the collisional quenching of O(21D2) are reported for the gases NH3, H2O2, C2H6 C3H8, and C(CH3)4. These are found to be respectively (in units of 10−10 cm3 molecule−1 S−1 at 300 K), 6.3 ± 0.7, 5.2 ± 0.6, 7.3 ± 0.8, 9.5 ± 1.0, and 12.3 ± 1.3. With the exception of a recent measurement for NH3• these data represent the first absolute measurements for these quenching gases. Further, a general comparison is made between absolute rate measurements using this technique and recent work by Schiff and co-workers using time-resolved emission at λ = 630 nm (O(21D2) → O(23P2)) in order to monitor the excited atoms.

REACTIONS INVOLVING ELECTRONICALLY-EXCITED OXYGEN

1958 ◽  
Vol 36 (1) ◽  
pp. 79-88 ◽  
Author(s):  
E. Kerry Gill ◽  
K. J. Laidler
Keyword(s):  
Experimental Evidence ◽  
Excited States ◽  
Potential Energy Surfaces ◽  
Oxygen Molecule ◽  
Mechanism Of Formation ◽  
Electronically Excited States ◽  
Excited Species ◽  
Electronically Excited ◽  
Energy Surfaces ◽  
Excited Oxygen

The various electronically-excited states of oxygen atoms and molecules are briefly considered. Certain reactions involving some of these electronically-excited species are then discussed with reference to the experimental evidence and to the potential-energy surfaces on which they occur. In the case of the mercury-photosensitized formation of ozone from oxygen it is concluded that both experimental evidence and theoretical arguments point to the fact that the oxygen molecule initially formed is in an excited [Formula: see text] state. Consideration is also given to the mechanism of formation of O2* in the carbon monoxide flame and in other flames. The reactions[Formula: see text]and[Formula: see text]are also discussed briefly.

Collision integrals of oxygen atoms and ions in electronically excited states

2008 ◽  
Vol 344 (1-2) ◽  
pp. 13-20 ◽  
Author(s):  
A. Laricchiuta ◽  
D. Bruno ◽  
M. Capitelli ◽  
R. Celiberto ◽  
C. Gorse ◽  
...  
Keyword(s):  
Excited States ◽  
Collision Integrals ◽  
Electronically Excited States ◽  
Electronically Excited ◽  
Oxygen Atoms

Branching ratios for electronically excited oxygen atoms formed in the reaction of N+ with O2 at 300 K

1986 ◽  
Vol 84 (4) ◽  
pp. 2158-2166 ◽  
Author(s):  
Andrew O. Langford ◽  
Veronica M. Bierbaum ◽  
Stephen R. Leone
Keyword(s):  
Branching Ratios ◽  
Electronically Excited ◽  
Excited Oxygen ◽  
Oxygen Atoms
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