Observation of a new electronic state of carbon monoxide using LIF on highly vibrationally excited CO(X 1Σ+)

1983 ◽  
Vol 79 (1) ◽  
pp. 12-18 ◽  
Author(s):  
G. L. Wolk ◽  
J. W. Rich
Keyword(s):  
Carbon Monoxide ◽  
Electronic State ◽  
Vibrationally Excited

scholarly journals The flame spectrum of carbon monoxide

1940 ◽  
Vol 176 (967) ◽  
pp. 505-521 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Electronic State ◽  
Excited Electronic State ◽  
Combustion Process ◽  
Wave Number ◽  
Band Spectrum ◽  
Liquid Form ◽  
Triangular Form ◽  
Reduced Pressure

The spectrum of the flame of carbon monoxide burning in air and in oxygen at reduced pressure has been photographed on plates of high contrast which display the band spectrum clearly above the continuous background. Greater detail has been obtained than has been recorded previously and new measurements are given. The structure of the spectrum has been studied systematically. It is shown that the bands occur in pairs with a separation of about 60 cm. -1 , this separation being due probably to the rotational structure. Various wave-number differences are found to occur frequently, and many of the strong bands are arranged in arrays using intervals of 565 and 2065 cm. -1 . The possible origin of the spectrum is discussed. The choice of emitter is limited to a polyatomic oxide of carbon, of which carbon dioxide is the most likely. The spectrum of the suboxide C 3 O 2 shows some resemblance to the flame bands, but this molecule is improbable as the emitter on other grounds. A peroxide C0 3 is also a possibility, but no evidence for the presence of this has been obtained from experiments on the slow combustion of carbon monoxide. Carbon dioxide in gaseous or liquid form is transparent through the visible and quartz ultra-violet, and the flame bands are not obtained from CO 2 in discharge tubes. Comparison with the Schumann-Runge bands of oxygen shows that it is possible that the flame bands may form part of the absorption band system of CO 2 which is known to exist below 1700 A if there is a big change in shape or size of the molecule in the two electronic states. The electronic energy levels of CO 2 are discussed. Since normal CO 2 is not built up from normal CO and oxygen, an electronic rearrangement of the CO 2 must occur after the combustion process. Mulliken has suggested that the molecule in the first excited electronic state, corresponding to absorption below 1700 A, may have a triangular form. The frequencies obtained from the flame bands are compared with the infra-red frequencies of CO 2 . The 565 interval may be identified with the transverse vibration v 2 , indicating that the excited electronic state is probably triangular in shape. The 2065 interval cannot, however, be identified with the asymmetric vibration v 3 with any certainty. If the excited electronic state of CO 2 is triangular, then molecules formed during the combustion by transitions from this level to the ground state may be “vibrationally activated”. This is probably the reason for many of the peculiarities of the combustion of carbon monoxide.

Deactivation of Vibrationally Excited Carbon Dioxide (001) by Collisions with Carbon Monoxide

1971 ◽  
Vol 54 (3) ◽  
pp. 1196-1205 ◽  
Author(s):  
W. A. Rosser ◽  
R. D. Sharma ◽  
E. T. Gerry
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Vibrationally Excited

AN IMPROVED TECHNIQUE FOR THE OBSERVATION OF INFRARED CHEMILUMINESCENCE: RESOLVED INFRARED EMISSION OF OH ARISING FROM THE SYSTEM H + O2

1960 ◽  
Vol 38 (10) ◽  
pp. 1742-1755 ◽  
Author(s):  
P. E. Charters ◽  
J. C. Polanyi
Keyword(s):  
Infrared Spectrum ◽  
Electronic State ◽  
Vibrational Temperature ◽  
Infrared Emission ◽  
Multiple Reflection ◽  
Ground Electronic State ◽  
Oh Radicals ◽  
Vibrationally Excited ◽  
Improved Technique ◽  
First Time

A multiple reflection apparatus for the observation of infrared chemiluminescence is described. By means of this apparatus infrared emission from the system H + O2 has been identified as being due to vibrationally excited OH radicals in levels v = 1, 2, and 3 of the ground electronic state. The resolved infrared spectrum of the OH fundamental has been observed for the first time without interference from other emission. The most likely source of excited OH is the reaction H + HO2 → OH† + OH. The vibrational 'temperature' of OH† (vibrationally excited OH in its ground electronic state) in our system is in the region of TV = 2240 °K. These findings are discussed in relation to Krassovsky's suggestion that reaction between H and O2 could account for the Meinel hydroxyl bands in the night sky.

Production of Vibrationally Excited Carbon Monoxide by the Reaction of Oxygen Atoms with Acetylene, Methylacetylene, and Methane

1973 ◽  
Vol 51 (3) ◽  
pp. 451-455
Author(s):  
S. J. Arnold ◽  
G. H. Kimbell
Keyword(s):  
Carbon Monoxide ◽  
Electrical Discharge ◽  
Population Inversion ◽  
Continuous Wave ◽  
Microwave Discharge ◽  
Vibrationally Excited ◽  
Vibrational Population ◽  
Oxygen Atoms

Infrared chemiluminescence attributed to the first overtone of CO was observed when either C2H2 or was introduced into a stream of oxygen which had been passed through a microwave discharge. The addition of vibrationally cold CO to these systems was found to produce a vibrational population inversion in the chemically formed CO. CO first overtone emission was not observed when CH4 was introduced into a similar stream of oxygen unless the CH4 had been subjected to a microwave discharge. These observations are used to clarify the mechanisms governing the formation of CO in continuous wave air–helium–hydrocarbon electrical discharge lasers.

Sign in / Sign up

Export Citation Format

Share Document