Reference wavelengths for calibrating prism spectrometers

Abstract

da rd wa \" clengLh s for cali b ratin g infrar ed-pri sm in str um ent s nave b een mea sured fro m t h e a bso rpLion ba nds of p olysty rene, 1, 2,4-trichlo roben zen e, a nd toluene. Several b an d s of didym ium glass h ave been ca librated for t h e nca r-infra r ed r egion , an d 27 rotat ion a llin es of t h e 3. 3-micro n b an d of m et h an e h ave been m easured.Th e wavelengths fall in Lh e reg ion fr om 0. 6 to 24 m icron s, bu t t he g reatest numb er a r c in t h e 3-to 6-m icron r eg ion . A few band s of seve ral other m ate rials are a lso give n i n t h e \\'avc!e ngth t a bles, and 11 fi gurE' S of t h e Rp ectra ma rk ed w it h t he cali braLing valu es a re i ncl ucl ed for id en t ifi ca t ion .

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

“…Under low resolution (see ref. [ 11 ]) the Q branch, which extends over 5.5 cm −1 and consists of hundreds of lines is probably good to 0.5 cm −1 .…”

“…Eight bands from 6 to 14.4 μ have been remeasured and the results are compared with the previous measurements of 1950 and the additional measurements of Plyler, Blaine, and Nowak (see ref. [ 11 ]) in 1957. The spectrum is shown in figure 17 and the wavelengths and wave numbers in vacuum are listed in table 16 .…”

“…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.…”

Soil Components

“…Instruments are not always in perfect adjustment, and the user must assure himself of the accuracy and reproducibility of his recordings by the use of such standard test substances as indene ), polystyrene film (PLYLER et al [1957]), and atmospheric and other gases (DOWNIE et al [1953]). Instruments are not always in perfect adjustment, and the user must assure himself of the accuracy and reproducibility of his recordings by the use of such standard test substances as indene ), polystyrene film (PLYLER et al [1957]), and atmospheric and other gases (DOWNIE et al [1953]).…”

Further studies on the collision-induced absorption of the fundamental band of hydrogen at room temperature

“…The frequency calibration of the spectral region of the band was made using the known absorption frequencies of the atmospheric water vapor (Benedict and Plyler 1951 ; I.U.P.A.C. Tables of Wave Numbers, 196 1) and 1,2,4,-trichlorobenzene (Plyler, Blaine, and Nowak 1957 Profiles of the enhancement of absorption of the fundamental band of hydrogen in hydrogen-oxygen assembly to avoid any trace of oil or grease. To obtain the required pressures of oxygen (or xenon), two stainless-steel thermal compressors were used, thus avoiding the use of an oil pump.…”