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The ND Radical: Laboratory Measurement of theN= 2–1 Rotational Transition at 1 THz

✍ Scribed by Shuro Takano; Thomas Klaus; Gisbert Winnewisser

Book ID
102596863
Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
367 KB
Volume
192
Category
Article
ISSN
0022-2852

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✦ Synopsis

The N ϭ 2-1 pure rotational transition of the ND radical (X 3 ⌺ Ϫ ) near 1 THz was measured with the Cologne terahertz spectrometer. The ND radical was produced in a dc discharge of a flowing mixture of deuterated ammonia and helium. Frequencies of five strong fine-structure transitions with associated hyperfine components were precisely measured and analyzed to determine a complete set of accurate molecular constants, e.g., the rotational and centrifugal distortion constants B 0 ϭ 263265.4735(45) MHz and D 0 ϭ 14.62876(74) MHz, together with the fine and hyperfine constants. Based on these constants, the rotational frequencies of ND up to 4 THz were predicted with the aim to guide future astronomical searches. For completeness we also include similar predictions for NH.

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