The pure rotational spectrum of the sip radical (x2πi)
Burton, Mark
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https://hdl.handle.net/2142/107530
Description
Title
The pure rotational spectrum of the sip radical (x2πi)
Author(s)
Burton, Mark
Contributor(s)
Ziurys, Lucy M.
Sheridan, Phillip M.
Issue Date
2020-06-23
Keyword(s)
Astronomy
Abstract
The millimeter-wave spectrum of the SiP radical in its X$^{2}$$\Pi$$_{i}$ ground electronic state has been recorded using direct absorption spectroscopy in the frequency range 151 – 532 GHz. The species was synthesized in an AC discharge by the reaction of SiH$_{4}$ and red phosphorous, in argon carrier gas. Both lambda-doubling and hyperfine splittings, from the phosphorus nuclear spin (\textit{I} = 1/2), were observed in both spin-orbit ladders, $\Omega$ = 3/2 and 1/2. The $\Omega$ =1/2 ladder appears to be perturbed, presumably by the nearby A$^{2}$$\Sigma$ state, as suggested by previous optical data. The data were analyzed with a Hund’s case (a) Hamiltonian, establishing global spectroscopic constants. A deperturbation analysis was also conducted, further refining the $\Pi$-$\Sigma$ interaction.
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