The Rotational Spectrum of SH and SD

Abstract

With the Cologne terahertz spectrometer, the lower J rotational spectrum of the SD radical has beendetected for the Ðrst time in the laboratory, in analogy with our previous recent detection of the SHradical. The radicals were produced by discharging H bu{\dag}ered with He and The 2S (D2S) H2 (D2).spectra were analyzed employing HundÏs case (a) coupling scheme. The SH radical has an inverted 2%srtoattaet,ioansaldoanesd OceHnt,risfougtahladt istthoert2io%n3@c2osntsattaentiss, tthhee sepnienrgoertbiciat,llytheloswpeirn orontea.tiFoonr, tbhoeth"-SdHoubalnedt, SaDnd, tthheehyperÐne interaction constants were determined by combining the newly acquired experimental datawouitrhlathteosstevaavluaielafbolre SinHthise 2li8t3e5ra8t7u.6re2. (T1h2)e MroHtaztio(tnhael vcoalnusetsanint Bp0arfeonrthSeDsesisd1e4n6o8t8e5.t2h9e7c(a2l6c)ulMatHedz,uwncheirletaintyobtained by a least-squares Ðt). The SH radical and its deuterated isotopomer may be detectablein interstellar space because of the high cosmic abundance of elemental sulfur and the high abundance ofH Since the electronic state lies nearly 400 cm~1 above the state, the rotational tran- 2gsiotiooSdn.