# HYPERFINE STRUCTURE OF $ND_{3}$ INVERSION $SPECTRUM^{*}$

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 Title: HYPERFINE STRUCTURE OF $ND_{3}$ INVERSION $SPECTRUM^{*}$ Creators: Herrmann, Gabriel Issue Date: 1955 Publisher: Ohio State University Abstract: The inversion spectrum of $ND_{3}$ has been previously observed by Nuckols, Rueger and $Lyons^{1}$ in the region 1500 - 2500 Mc/sec. In the present work some of the hyperfine structure effects were investigated. Satellites due to the nuclear quadrupole moment of nitrogen were observed in several lines. The displacement of these satellites from the corresponding main lines is in agreement with theory and confirms the identification of the lines as given by Nuckols, Rueger, and Lyons. A value $eqQ = 4090 \pm 20$kc/sec was obtained for the quadrupole coupling constant of nitrogen, which is in good agreement with latest values obtained for $NH_{3}$.$^{2}$ In this work a Stark-Modulated L-band spectrograph was used, employing a cell of dimensions $10^{\prime} \times 6-1/2^{\prime\prime} \times 3-1/2^{\prime\prime}$ in a TEM mode. Half line widths as low as 15 kc/sec were observed. Description: $^{*}$Supported by the United States Air Force, through the Office of Scientific Research of the Air Research and Development Command. $^{1}$Nuckols, Rueger, and Lyons, Phys. Rev. 89:1101 (1953) $^{2}$Gunther - Mohr, White, Schawlow, Good, and Coles, Phys. Rev. 94:1184 (1954) Author Institution: Department of Physics, College of Engineering New York University URI: http://hdl.handle.net/1811/7351 Other Identifiers: 1955-C-5