Detection and characterization of the tin dihydride (SnH2 and SnD2) molecule in the gas phase

作者：Smith Tony C; Clouthier Dennis J^*

来源：Journal of Chemical Physics, 2018, 148(2): 024302.

DOI：10.1063/1.5011162

The SnH2 and SnD2 molecules have been detected for the first time in the gas phase by laser-induced fluorescence (LIF) and emission spectroscopic techniques through the (A) over tilde B-1(1)-(X) over tilde (1)A(1) electronic transition. These reactive species were prepared in a pulsed electric discharge jet using (CH3)(4)Sn or SnH4/SnD4 precursors diluted in high pressure argon. Transitions to the electronic excited state of the jet-cooled molecules were probed with LIF, and the ground state energy levels were measured from single rovibronic level emission spectra. The LIF spectrum of SnD2 afforded sufficient rotational structure to determine the ground and excited state geometries: r(0)'' = 1.768 A, theta(0)'' = 91.0 degrees, r(0)' = 1.729 angstrom, theta(0)' = 122.9 degrees. All of the observed LIF bands show evidence of a rotational-level-dependent predissociation process which rapidly decreases the fluorescence yield and lifetime with increasing rotational angular momentum in each excited vibronic level. This behavior is analogous to that observed in SiH2 and GeH2 and is suggested to lead to the formation of ground state tin atoms and hydrogen molecules. Published by AIP Publishing.

• 出版日期2018-1-14