MICROWAVE SPECTRAL TABLES Diatomic Molecules

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$Standard X-ray Diffraction Powder Patterns$

$Standard X-ray Diffraction Powder Patterns$

$Standard X-ray Diffraction$

In order to reduce transcription errors, all tabular material (except for the bibliography, molecular constants not used for computations, and a few exceptional cases) wasprinted automatically as computer output and reproduced photographically. The computer input was punched on cards and the cards verified by a second operator. Such verification isbetter than proofreading, since two independent operations are compared electrically.2. Description of TablesFor each spectral line, there are given the measured frequency and its uncertainty,the assigned "isotopic molecular species, " the assigned initial and final quantum numbers, areference, and intensities computed for 300° and 195° Kelvin. ("Isotopic molecular species"is used here to indicate a molecular species in which the isotopic species of each individualatom is specified. ) In table 1, the lines are listed alphabetically according to the International Union of Chemistry name of the compound [10] and cross-indexed according to all othercommonly used names. The listing is subdivided first according to the isotopic molecularspecies and then according to the major quantum numbers for the transitions. Within thesesubdivisions, hyperfine components and incompletely identified transitions are listed according to frequency. For each molecule, a table of molecular constants, such as line widths,rotational constants, dipole moments, and various coupling constants, is also given. Theseconstants comprise essentially all those reported in articles which include line frequencies*as well as all other constants used for the computations. The latter constants are commonlytaken from standard tabulations and, if necessary, adjusted with simple relations (see Computation of Intensities). The internuclear distances are given diagrammatic ally. Thedistance given is r , the distance to the minimum in the potential energy curve.Ordinarily, the frequencies and uncertainties given are those reported in the sourcedeemed most accurate. Because the uncertainties reported in so many of the papers are notprecisely defined, no attempt was made to reduce them to a common basis. The reader interested in precise estimates of both random and consistent error is referred to the originalpapers or to the authors themselves. If two or more sources seemed to be of comparable accuracy, an average of the frequencies was used. In general, the molecular constants aregiven as reported in the original article; it is not implied that the values are accurate to oneunit in the last reported digit. If insufficient data were available for computation of intensities,unknown factors (see Computation of Intensities) were put equal to unity and the values markedR for relative. No intensity was computed for ''forbidden" lines. For each group of unresolved lines, both the individual intensities and their sums are given. Being direct computer- 8output, the intensities are written, e.g. , in the form 41. E-08, meaning 41.xlOIV
Casimir's function and the hyperfine intensity splitting factor are given in table 2 (seeintroduction to table 2 and Computation of Intensities) [2: pages 151 and 499] . All the angular momenta are given for half-integral as well as integral values, permitting application toadditional molecules with unclosed (electronic) shells or, for the intensity, to additionalmolecules with hyperfine splitting caused by more than one nucleus.The four-digit numbers refer to the bibliography at the end of this volume. Apart fromthe numbers above 1725, the reference numbers are arranged according to year and thenalphabetically according to the first author. When constants obtained from non-microwavesources have been used in fitting parameters to microwave data, reference is commonlymade to the microwave paper rather than to the original source. The bibliography includesreferences to articles of possible interest, even to those giving no data suitable for inclusionin these tables.The spectral lines will be ordered according to frequency only in a final volume,along with lines from non-diatomic molecules.3. Symbols Used in TabulationsThe sources of some of the molecular constant data are indicated by small lettersimmediately following the individual values. The significances are as follows:Line width field:Dipole moment field:a rough average of values for many linesm microwave spectroscopic measurementc computed by assuming polarizable ions (for alkali halides)i computed from intensity and line widthm microwave Stark or electric resonance beam measurementp computed from polarization dataRotational constant field:c computed from another isotopic species assuming inverse proportionality to the reduced massm microwave measurement for the given isotopic speciesv computed from measured frequency neglecting centrifugal stretchingThe notations [2: equations (1-50)], [4: page 201], etc. , indicate equation (1-50) ofreference 2, page 201 of reference 4, etc. Most of the references given here are tostandard sources where both a general background and references to the original literaturemay be found.
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Page 5: Microwave Spectral TablesVolume I:
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Inl Indium iodide 2,75-39 AIsotopic
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19330004 Wick, G. C. , Z. Physik 85
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0190 Gilbert, D. A. ; Roberts, A. ;
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0375 Woodward, Nature 165, 198 (195
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0518 Carls on, R. O. ; Lee, C. A. ;
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0722 Lee, C. A. ; Fabric and, B. P.
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0898 Mizushima, M. ; Phys. Rev. 94,
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1061 Rosenblum, B. ; Nethercot, A.
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1235 Solomon, I. ; Bloembergen, N,
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1434 Boudouris, G. ; Ilias, D. ; Co
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1547 Favero, P. G. ; Mirri, A. M. ;
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9900 American Institute of Physics
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THE NATIONAL BUREAU OF STANDARDSThe
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MICROWAVE SPECTRAL TABLES Diatomic Molecules

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