Doppler-limited dye laser excitation spectroscopy of the DSO radical

On the Detectability of the HSS, HSO, and HOS Radicals in the Interstellar Medium

“…It is within 0.1 mdyn Å −2 of the same value previously computed with a similar approach for HSO These force constants are then utilized to compute the geometrical, vibrational, and rotational values produced in Table 2. Comparison with experiment (Ohashi et al 1980;Yoshikawa et al 2009) shows that the CcCR HSO values agree well with experiment for the rotational constants, quartic and sextic distortion constants, and the subsequent geometry. The vibrationally averaged rotational constants vary by less than 0.004 cm −1 (∼100 MHz) for the B and C constants, similar to values computed previously (Fortenberry et al 2011(Fortenberry et al , 2012a(Fortenberry et al , 2012b(Fortenberry et al , 2013(Fortenberry et al , 2014b.…”

“…The n n + difference between the theoretical results. However, combination bands are known to produce compounding errors in the Ohashi et al (1980). d HSO dipole moment from Webster et al (1982).…”

“…The  X A 2 HSO radical has been well-studied (Ohashi et al 1980;Webster et al 1982;Sears & McKellar 1983;Yoshikawa et al 2009;Cazzoli et al 2016), but far less is known about  X A 2 HOS, even less than  X A 2 HSS. The search for HSO has recently offered some frustrating results with coincidences for rotational lines of HSO observed in some regions and spectral windows but not in others (Cazzoli et al 2016).…”

Spectroscopy and structures of free radicals and molecular ions

“…We have found that the reaction of microwave discharge products of 02 with H2S also gives the HSO radical, and have applied this reaction to observe the laser excitation spectrum of HSO [5,6]. It has been known that the reaction of atomic oxygen with H2S efficiently generates the SO radical, which then combines with another 0 atom to produce energy-rich SO 2, resulting in the emission of strong bluechemiluminescence:…”

“…The precise molecular parameters derived from the laser excitation spectrum [5,6] and the method of producing HSO mentioned above prompted us to examine the microwave spectrum of HSO in the ground electronic state, primarily to obtain more detailed information on this radical. However, we soon realized that the new method is not suitable for microwave study, because most of the HSO generated at the inlet of a cell is destroyed before it reaches the outlet.…”