Abstract
Modifications affecting the resolution and frequency calibration capability of the Beckman IR-9 infrared spectrophotometer are described and discussed. Under favorable conditions these modifications enable the instrument to be calibrated with an absolute accuracy of 0.03 cm−1 or better; resolution is also improved so that spectral slitwidths may be reduced by approximately √2 over normal specifications. These results are illustrated with vibration-rotation spectra from NH3, CH4, and HBr.
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References
1.
Krueger
P. J.
and
Schulze
G. H.
, Rev. Sci. Instr. 34 , 88 (1963 ).
2.
Krueger
P. J.
, Appl. Opt. 1 , 443 (1962 ).
3.
Wyatt
R.
Roberts
J. T.
Wentz
R. E.
, and
Wilt
P. M.
, J. Chem. Phys. 50 , 2552 (1969 ).
4.
Duncan
J. L.
and
Ellis
D.
, J. Mol. Spectrosc. 28 , 540 (1968 ).
5.
Beckman Instruments, Inc.
, IR-9 Infrared Spectrophotometer Instruction Manual (1966 ), p. 18 .
6.
The position of this shift gear is clearly shown in Fig. 20 of Ref. 5.
7.
International Union of Pure and Applied Chemistry
, Tables of Wavenumbers for the Calibration of Infrared Spectrometers (Butterworths , London , 1961 ).
8.
Botineau
J.
, J. Mol. Spectrosc. 41 , 182 (1972 ).
9.
Ref. 5, p. 16 .
10.
Mould
H. M.
Price
W. C.
, and
Wilkinson
G. R.
, Spectrochim. Acta 15 , 313 (1959 ).
11.
Garing
J. S.
Nielsen
H. H.
, and
Rao
Narahari K.
, J. Mol. Spectrosc. 3 , 496 (1959 ).
12.
Rank
D. H.
, J. Opt. Soc. Am. 42 , 279 (1952 ).