Diode laser spectroscopy of Q branches at 662-666 cm/sup -1/ of CO/sub 2/ enriched in /sup 18/O and /sup 17/O

Conference · Mon Jan 01 04:00:00 EST 1979 · Proc. Soc. Photo-Opt. Instrum. Eng.; (United States)

OSTI ID:6523676

Flicker, H ^[1]; Nereson, N G; Benedict, W S

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1. Los Alamos Scientific Lab., NM

Measurements have been made of the absorption of CO/sub 2/ samples enriched in /sup 18/O and /sup 17/O by tunable diode lasers in the wave-number region 662.2 to 666.1 cm/sup -1/. The fundamental Q-branches of the /sup 16/O/sup 12/C/sup 18/O, /sup 16/O/sup 12/C/sup 17/O and /sup 17/O/sup 12/C/sup 17/O molecules are well resolved, together with hot Q branches and various R- and P-branch lines of other isotopic species; notably /sup 18/O/sup 12/C/sup 18/O and /sup 17/O/sup 12/C/sup 18/O. The molecular constants for the Q branch 01/sup 1/0 reverse arrow 00/sup 0/0 of /sup 16/O/sup 12/C/sup 18/O have been calculated by a least mean square fit to lines J + 1 to 16 to be: nu/sub 0/ = 662.3717 +- 0.0003 cm/sup -1/, ..delta.. B = 9.65 +- 0.02 x 10/sup -4/ cm/sup -1/; where nu/sub 0/ has been fixed in absolute magnitude by assuming the /sup 16/O/sup 12/C/sup 16/O line, 02/sup 2/0 reverse arrow 01/sup 1/0 P7, as a reference standard at 662.325 cm/sup -1/. More accurate values for ..delta.. B and ..delta.. D can be obtained by using the separation between several R lines and adjacent Q lines, and the known positions of the R lines relative to the origin to obtain: ..delta.. B = 9.685 +- 0.002 x 10/sup -1/ and ..delta.. D = 2.2 +- 0.1 x 10/sup -9/ cm/sup -1/. Other molecular constants can be determined with highest precision by using low J-, R-, and P-branch lines as calibration standards, together with etalon spacing. The calculated line positions of the fundamental Q branch can be used as secondary standards to fit the hot bands.

• OSTI ID: 6523676
• Conference Information: Journal Name: Proc. Soc. Photo-Opt. Instrum. Eng.; (United States) Journal Volume: 190
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
CARBON 12
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
DATA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
ISOTOPES
LASER SPECTROSCOPY
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN 17
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES