Some accurately measured infrared wavelengths for calibration of grating spectrometers

Abstract

The m easu red values of the wa velen gths of 60 lines in t he 1.1-to 2.3-micron spectral r egion are reported. T he a bsorpt ion lines of the ba nd s of .m ethane and w~ter vapor were used in the calibration. T he m ethods of measurement are disc ussed . Also d Iscussed a re the m ethods of superi mposing t he well-known em.ission lines of se.ver al sources on t he ~bsorpt ion lines tha t were meas ured. T he values obtained for some hnes are compa red with values reported by other workers.

Propagation of Visible and Infrared Waves in the Atmosphere (Rasprostranenie Vidimykh i Infrakrasnykh Voln v Atmosfere)

“…Thus, at an altitude of 0.1 km in the winter the concentration of -242-partiyles with r>4 p was equal to 3 1-1, and in the summer to 60 …”

“…As an illustration, Fig. 2.8 shows the part of the spectrum of the vibration-rotation H 2 0 band, the width of which is only 0.07 p in the region -75-F of the 1.38 p band, which was recorded by a high resolution instrument [60].…”

“…Plyler, Gailar and Wiggins [60] studied with high resolution the vibration-rotation water vapor spectrum and determined with great difficulty certain wavelengths which are needed to calibrate spectrometers.…”

THE ν3 INFRARED BAND OF AMMONIA

“…Certain lines in the 1.4 p band of water measured by Plyler, Gailar, and Wiggins (8) were used in the 3380-3500 crn.r1 region, and the v 3 band of hydrogen cyanide provided standards between 3300 and 3400 cm.-I. T h e rotational constants B', B", D', and D" for the latter band call be calculated very precisely from the results of Ranli, Shearer, and Wiggins for 2 v 3 (9), and the v s band origin 3311.47 was fixed by comparison with Hg 10139.67 and Hg 15295.82.…”

Vibration-rotation structure in absorption bands for the calibration of spectrometers from 2 to 16 microns

“…In recent years, infrared spectroscopists have expressed concern regarding satisfactory methods and wavelengths for calibrating good prism and small grating spectrometers [ 1 , 2 , 3 , 4 ]. 3 In the past, a number of publications [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ] from several laboratories did tend to ease the immediate requirements; but with the influx of finer instruments the need for more thorough, suitable, and precise coverage has arisen. Professor Mizushima and fellow workers have clearly indicated in their detailed measurements [ 12 ] that the small grating instruments are certainly capable of producing rather precise data.…”