Abstract
Radiation of a cw CO2 laser can be used to excite infrared emission spectra of nearly all molecular gases by adding small amounts of SF6 as a sensitizer. These emission spectra show a thermal equilibrium between vibrational, rotational, and translational states with temperatures up to 1200 K. Temperature profiles of these gases about a focused cw CO2 laser beam are analyzed by Raman spectroscopy. The detection of small amounts of sample and investigations of cw laser-induced chemical reactions are interesting potential applications.
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References
1.
Gürs
K.
Angew
Z.
, Physik 25 , 379 (1968 ).
2.
Hirschfeld
T.
, Appl. Spectr. 30 , 68 (1976 ).
3.
Demtröder
W.
, Spectroscopy with Lasers, Topics in Current Chemistry, Vol. 17: Laser Spectroscopy (Springer-Verlag , Berlin , 1973 ), p. 19 .
4.
Einstein
A.
, Physik. Z. 18 , 121 (1917 ).
5.
Rutkovskii
K. S.
Tokhadze
K. G.
, Sov. Phys. JETP 48 , 204 (1978 ).
6.
Duley
W. W.
, CO2-Lasers (Academic Press , New York , 1976 ).
7.
Penner
S. S.
, Quantitative Molecular Spectroscopy and Gas Emissivities (Addison-Wesley , Reading, Massachusetts , 1959 ).
8.
Gutberlet
H.
, Dissertation: Schwingungsanregung Gasförmiger Organischer Verbindungen mit einem CO2-Laser , Dortmund (1978 ).
9.
Herzberg
G.
, Molecular Spectra and Molecular Structure (Van Nostrand Reinhold New York , 1950 ), Vol. I .
10.
Pepperhoff
W.
Bähr
A.
, Arch. Eisenhüttenwesen 23 , 335 (1952 ).
11.
Pepperhoff
W.
Graß
G.
, Arch. Eisenhüttenwesen 26 , 9 (1955 ).
12.CRC Handbook of Chemistry and Physics ,
Weast
R. C.
, Ed. (CRC Press , Cleveland, Ohio , 1977/78 ), 58th ed. , p. E-2 .
13.
Griffiths
P. R.
, Chemical Infrared Fourier Transform Spectroscopy (John Wiley & Sons , New York , 1975 ), Chap. 12.
14.
Belz
H. H.
, Dissertation: CO2-Laser-angeregte Infrarot-Emissionsspektroskopie von Gasen mit einem Fourier-Transform-Spektrometer , Essen (1981 ).
15.
Shaub
W. M.
Bauer
S. H.
, Int. J. Chem. Kin. 7 , 509 (1975 ).
16.
Cheng
C.
Keehn
P.
, J. Am. Chem. Soc. 99 , 5808 (1977 ).
17.
Fuss
W.
Hartmann
J.
, J. Chem. Phys. 70 , 5468 (1979 ).
18.
Deutsch
T. F.
Brueck
S. R. J.
, J. Chem. Phys. 70 , 2063 (1979 ).
19.
Plyler
E. K.
Tidwell
E. D.
, J. Opt. Soc. Am. 53 , 589 (1963 ).
20.
Nielsen
J. R.
Thornton
V.
Dale
Brock E.
, Rev. Mod. Phys. 16 , 307 (1944 ).
21.
Nibler
J. W.
McDonald
J. R.
Harvey
A. E.
, Opt. Commun. 18 , 371 (1976 ).
22.
Bagratashvili
V. N.
Vainer
Yu. G.
Ddjikov
V. S.
Koliakov
S. F.
Makarov
A. A.
Malyavkin
L. P.
Ryabev
E. A.
Silkis
E. G.
Titov
V. D.
, Appl. Phys. 22 , 101 (1980 ).
23.
Schallert
B.
, Dissertation: Berührungslose Temperaturbestimmung mit Hilfe der Raman-Spektroskopie an CO2-Laser-bestrahlten Gasen , Essen (1982 ).
24.
Lapp
M.
Penney
C. M.
, Laser Raman Gas Diagnostics (Plenum Press , New York , 1974 ), pp. 107 –188 .