University of Illinois Urbana-Champaign

Rotational spectroscopy of silicon-nitrogen molecules: SiH3NC and NH2Si

Lee, Kelvin

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1346156.pdf
3668.pdf

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https://hdl.handle.net/2142/104532

Description

Title
Rotational spectroscopy of silicon-nitrogen molecules: SiH3NC and NH2Si
Author(s)
Lee, Kelvin
Contributor(s)
  • McCarthy, Michael C.
  • Gottlieb, Carl A.
  • Kocheril, G. Stephen
Issue Date
2019-06-20
Keyword(s)
Rotational structure/frequencies
Date of Ingest
  • 2019-07-15T22:17:07Z
  • 2020-01-25T19:31:32Z
Abstract
Silicon-nitrogen compounds are an important class of molecules, with implications in fields ranging from molecular astrophysics as refractory species in evolved stars, and in terrestrial applications such as chemical vapor deposition. In this talk, we present the gas-phase detection and microwave rotational spectroscopy of two new silicon-nitrogen molecules: silyl isocyanide (\chem{SiH_3NC}, $\tilde{X}~\mathrm{^1A_1}$) and aminosilane (\chem{H_2NSi}, $\tilde{X}~\mathrm{^2B_2}$). Both species are readily produced in an electrical discharge, combining silane (\chem{SiH_4}) with either methyl cyanide (\chem{CH_3CN}) or ammonia (\chem{NH_3}) to produce the species of interest. Using Fourier-transform and double resonance microwave spectroscopy, we were able to measure the three lowest rotational transitions (at 10, 20, 30\,GHz) for \chem{SiH_3NC}, and for \chem{H_2NSi}, the two lowest transitions at 30 and 60\,GHz. By substituting the precursors for rare-isotope enriched ones (e.g. $^{15}$NH$_3$), we were able to extend the measurements to several isotopologues: SiH$_3^{15}$NC and SiH$_3$N$^{13}$C for silyl isocyanide, and H$_2$~$^{15}$NSi, D$_2$NSi for aminosilane. The experiments are supplemented by high level quantum chemical calculations, which provided predictions of rotational constants, multipole moments, and in the case of aminosilane, the spin-rotation interaction tensor elements.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/104532
DOI
https://doi.org/10.15278/isms.2019.RI03
Copyright and License Information
Copyright 2019 Kelvin Lee

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Abstracts & Presentations - 2019 International Symposium on Molecular Spectroscopy PRIMARY