| Issue |
A&A
Volume 520, September-October 2010
|
|
|---|---|---|
| Article Number | A19 | |
| Number of page(s) | 4 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361/201013998 | |
| Published online | 23 September 2010 | |
Absorption cross section of molecular oxygen in the transition E 3Σu- v = 0 – X 3Σg- v = 0 at 38 K
1
National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan e-mail: bmcheng@nsrrc.org.tw
2
Escuela de Quimica y CELEQ, Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San Pedro de Montes de Oca, San Jose 2060, Costa Rica
Received:
6
January
2010
Accepted:
20
April
2010
Aims. This investigation was undertaken to determine the absorption cross sections of oxygen in the VUV region at temperatures <50 K.
Methods. The absorption spectra of gaseous samples cooled with a slit jet and near 300 K were measured with the same absorption system coupled to the VUV beam line of a synchrotron.
Results. The maximum absorption cross section for the transition from X 3Σg- v = 0 to state E 3Σu- v = 0 for 16O2 at 38 K was determined to be 98.7 Mb (or 9.87×10-18 cm2). The value of this maximum absorption cross section at 38 K is 1.7 times the value at 303.7 K.
Key words: astronomical databases: miscellaneous / molecular data / techniques: spectroscopic / ultraviolet: general
© ESO, 2010
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