Hydroxysilylene (HSi-OH) in the gas phase

Area of Science:

• Physical Chemistry
• Spectroscopy
• Molecular Physics

Background:

• Hydroxysilylene (HSiOH) is a highly reactive molecule.
• Previous studies have lacked experimental data on its structure and electronic transitions.

Purpose of the Study:

• To spectroscopically identify and characterize the hydroxysilylene (HSiOH) molecule in the gas phase.
• To determine the ground and excited state molecular structures of HSiOH.

Main Methods:

• Production of HSiOH using a twin electric discharge jet with specific precursor gases.
• Laser-induced fluorescence (LIF) spectroscopy to detect and analyze HSiOH.
• High-resolution, rotationally resolved spectra to determine molecular structures.

Main Results:

• First-time spectroscopic identification of HSiOH in the gas phase.
• Assignment of the Ã1A-X~1A' electronic transition in the 455-420 nm region.
• Determination of the trans-HSiOH ground state structure and a skew-HSiOH excited state structure (dihedral angle of 102°).

Conclusions:

• The trans isomer is the most stable ground state of HSiOH.
• The excited state exhibits a skew geometry, consistent with theoretical predictions.
• Further experimental and theoretical studies are needed for a complete understanding of HSiOH's electronic spectrum.