Peter J. Krueger, "Performance of the Beckman IR-7 Infrared Spectrophotometer 2. Frequency Reproducibility and Accuracy (200–800 cm−1)," Appl. Opt. 1, 621-625 (1962)
A Beckman IR-7 prism/grating infrared spectrophotometer, modified with a fiducial frequency marking system, has been calibrated with an estimated absolute accuracy of up to ±0.05 cm−1 in certain parts of the CsI foreprism range 200–800 cm−1. This represents an approximate tenfold improvement over the manufacturer’s specifications. The frequency reproducibility of the modified instrument and the linearity of the frequency (wave-number) presentation have been critically examined. A calibration scheme for this region is presented.
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With KBr or CsBr windows.
Approximate values (programmed slit used).
Based on three independent experimental measurements of each line.
Single-beam spectrum.
Optical path purged with dry air.
Except for lines with frequencies below 271 cm−1; see text.
Optical path length of 569.7 cm at about 30% relative humidity, 27°C.
Prepared from D2O, P2O5, and KCN.
Matheson, anhydrous, 99.99% min.
Matheson, 98.0% min.
Prepared by action of dilute H2SO4 on KCN.
Welder’s grade.
Table II
Absorption Maxima in the Infrared Spectrum of Indene–Camphor–Cyclohexanone Suitable for Calibration of Low-Resolution Spectrophotometers (200–800 cm−1).a Nominal Path Length 0.05 mm, CsBr cell. “Standard” Slit Schedule.b
Three components 1:1:1 by weight; due to overlapping of bands some of these maxima may be concentration dependent.
This constant energy double-beam slit schedule leads to calculated slit widths of 1.0–0.65 cm−1 in the first order (200–500 cm−1) and 0.5–0.75 in the second order (450–800 cm−1).
Band duo to camphor.
Band due to cyclohexanone.
With KBr or CsBr windows.
Approximate values (programmed slit used).
Based on three independent experimental measurements of each line.
Single-beam spectrum.
Optical path purged with dry air.
Except for lines with frequencies below 271 cm−1; see text.
Optical path length of 569.7 cm at about 30% relative humidity, 27°C.
Prepared from D2O, P2O5, and KCN.
Matheson, anhydrous, 99.99% min.
Matheson, 98.0% min.
Prepared by action of dilute H2SO4 on KCN.
Welder’s grade.
Table II
Absorption Maxima in the Infrared Spectrum of Indene–Camphor–Cyclohexanone Suitable for Calibration of Low-Resolution Spectrophotometers (200–800 cm−1).a Nominal Path Length 0.05 mm, CsBr cell. “Standard” Slit Schedule.b
Three components 1:1:1 by weight; due to overlapping of bands some of these maxima may be concentration dependent.
This constant energy double-beam slit schedule leads to calculated slit widths of 1.0–0.65 cm−1 in the first order (200–500 cm−1) and 0.5–0.75 in the second order (450–800 cm−1).
Band duo to camphor.
Band due to cyclohexanone.
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