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- W2183664123 abstract "The A3H-X3Z1system of NH has been known for a very long time. The bands were first described by Eder (I) in 1893 and have been the subject of many subsequent investigations. The main branches of the O-O and 1 1 bands were assigned from emission spectra by Funke (2) in the 1930s. The analysis was greatly improved by the observation of the 1-O and O-O bands in absorption by Dixon (3). His use of a room temperature source made it possible to observe most of the satellite branches, which drop rapidly in intensity with increasing rotation. Dixon was thus able to correctly assign his measurements together with those of Funke, and obtained reasonably accurate rotational and fine structure constants for the ground and excited states. Additional measurements on the O-O and l1 bands were made by Murai and Shimauchi (4) while the weak 01, l-2, l-0, and 21 bands were recorded by Malicet et al. (5). The A311-X32system of the isotopic species ND has been studied by Shimauchi (6) and by Bollmark et al. (7). The accuracy of all these measurements was limited to, at best, +0.03 cm-’ by the use of grating spectrographs. The development of CW dye lasers around 1970 did not help as the transition occurs near 3360 A-well into the ultraviolet. However, the recent development of intracavity frequency doubling has made it possible to record laser-induced fluorescence spectra in the W. Ubachs et al. (8) recorded the laserinduced fluorescence spectrum of the A3H-X3Zsystem of NH in a molecular beam. Their linewidth was sufficiently reduced that they were able to resolve the hypertine structure of both nuclei. While they were able to measure hyperfine splittings accurate to +0.00007 cm-‘, they did not attempt an absolute frequency calibration of the rotational lines and hence did not determine any rotational or fine structure constants. We have remeasured the A311-X38system of NH using a Fourier transform speo trometer with a precision of ~0.0002 cm-’ for the strong, unblended lines in the O-O band, an improvement of more than two orders of magnitude over the previous best measurements. Several high-resolution studies of the ground state have been made, measuring both pure rotation and vibration-rotation transitions. The far-infrared laser magnetic resonance spectrum was recorded by Radford and Litvak (9) and by Wayne and Radford" @default.
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- W2183664123 date "1986-01-01" @default.
- W2183664123 modified "2023-09-27" @default.
- W2183664123 title "Fourier Transform Spectroscopy of the A311-X32- Transition of NH" @default.
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