TY  - JOUR
A1  - Comes, Franz Josef
A1  - Fink, Ewald H.
T1  - Quenching of CO(B1Σ+, ν=0) by He, Ne, Ar, H2 and D2
T2  - Zeitschrift für Naturforschung, A
N2  - Excitation of CO molecules into the lowest vibrational level of the B1Σ+ electronic state by absorption of the (B 1Σ+υ′=0 →X 1Σ+ ,υ′′=0) resonance band at 1150 Å has been studied under various experimental conditions by observing the steady state fluorescence of the (B 1Σ+→A1Π) Angstrom bands. Stern-Volmer plots of the fluorescence intensities at the addition of various foreign gases yielded straight lines whose slopes k̃qм = kqм · τeff were strongly dependent on the CO sample pressure. This effect was found to be due to changes of the effective radiative lifetime of the B 1Σ+υ′=0 because of resonance trapping of the (0,0) band of the (B → X) fluorescence. The CO(B 1Σ+υ′=0) molecules are found to be quenched by He, Ne, Ar, H2 and D2 with effective collision cross sections of 0.23, 0.48, 22.4, 10.7, and 11.4 Å2, respectively, at 298 °K. In addition, an approximate value for the ratio ABA/ (ABA+ABX)of the radiative transition probabilities of the (B → A) and (B → X) transitions could be derived from the measurements.
Y1  - 2014
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/74033
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-740332
SN  - 1865-7109
VL  - 28
IS  - 5
SP  - 717
EP  - 724
PB  - Verlag der Zeitschrift für Naturforschung
CY  - Tübingen
ER  -