Microwave Spectral Tables This five-volume NBS Monograph presents a comprehensive compilation of microwave spectra including measured frequencies, assigned molecular species, assigned quantum numbers, and molecular constants determined from these data. The volumes are available by purchase from the Superintendent of Documents, Government Printing Office, Washington, D.C. 20402. Orders from foreign countries should include an additional one-fourth of the price of the publication to cover the postage. Titles of the volumes I. Diatomic Molecules, $2.00 II. Line Strengths of Asymmetric Rotors, $3.00 III. Polyatomic Molecules With Internal Rotation (In press) Library of Congress Catalog Card Number: 63-62235 II Foreword The present volume of the Bureau of Standards Spectral Tables will be welcomed by microwave spectroscopists and those who are interested in applying microwave spectroscopy to analytical and other practical purposes. The great accuracy with which microwave lines can be measured, the broad range of frequencies which can be covered, and the sharpness of microwave lines makes this field of spectroscopy in many ways comparable to optical atomic spectroscopy. We need much more practical experience in the utilization of this technique for analytical purposes; but it certainly seems that the accurate measurement of a very few spectral lines should serve to identify with very great certainty the presence of a compound whose lines have been tabulated. However, without tables such as these it was impractical to make the literature search required to find out what substance was causing a given set of frequencies. Now this should be a very easy matter. I certainly look forward to the wide utilization of these tables not only by those who have already been working in this field, but by new workers who will now find it much more convenient to utilize this tool to help solve their own identification and characterization problems. Naturally no set of tables of this kind can be complete, either with respect to the substances covered or the spectral lines of any given substance, so the fact that an observed line is not listed in these tables is not usually meaningful. However, if the spectrum of a given substance has been partly mapped and listed herein, its presence in a mixture (if its proportion is high enough) should be readily detected if enough of the observed lines are searched for in the present listing. When a line has been tentatively identified, one can then turn to Vols. I, III or IV of this series and look for other known strong lines of the substance to use as corroboration. E. BRIGHT WILSON, Harvard University. III Microwave Spectral Tables Spectral Line Listing Marian S. Cord, Matthew S. Lojko, and Jean D. Petersen This volume is a listing of the spectral lines reported in Volumes I, III, and IV of the Microwave Spectral Tables. These lines are listed according to ascending magnitude of frequency and should provide a ready reference. Key words: Microwave spectra, molecular spectra, spectral lines, rotational quantum Introduction Volume V of Monograph 70 is a listing of the spectral lines reported in Volumes I, III, and IV of the Microwave Spectral Tables. These lines have been automatically sorted and are listed according to ascending magnitude of frequency. For each spectral line the following data are given in order: the formula for the molecular isotopic species; the number of the volume of this series in which the line was originally tabulated (1, 3, or 4); the identification number used in that volume for ready reference (in Volume I no identification numbers were used); rotational quantum number, given in the general form J', K'_,, K',, ← J, K – 1, K + 1 (primes denoting upper state); the vibrational state (ground, excited, or blank, if unknown); the hyperfine quantum numbers; the frequency, and its accuracy (if given in the article from which the line was reported). Volume II contains no spectral lines. While the material for this volume was prepared as part of the reviewing for the previous ones, most credit for the presentation of the data is due to the effort expended on the programing which was required to accomplish the tremendous job of sorting and tabulating. The authors would like to acknowledge help given in this regard by Mrs. Judith Stephenson and Miss Carol Nielsen. V |