Decomposition of vibronic and renner-teller structure in C2H and C2D from anion high-resolution photoelectron imaging
Gibson, Stephen T.
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https://hdl.handle.net/2142/100782
Description
Title
Decomposition of vibronic and renner-teller structure in C2H and C2D from anion high-resolution photoelectron imaging
Author(s)
Gibson, Stephen T.
Contributor(s)
Laws, Benjamin A.
Issue Date
2018-06-18
Keyword(s)
Radicals
Abstract
The ethynyl radial, C2H, has a complex spectral structure due to vibronic coupling between the ground X˜ 2Σ + and lowlying A˜ 2Π electronic states, and a Renner-Teller interaction within the Π state.
A good understanding of the low-lying rovibrational structure has come from measurements, including slow electron velocity-map imaging of anion photoelectron spectraa , and ab initio calculationsb , that give wavefunction character.
In this work, high-resolution photoelectron velocity-map imaging of C2H − and C2D − photodetachment (the 355 nm wavelength illustrated), provide a quantitative comparison over an extended energy range, to reveal unassigned structure, anomalous intensities, and illustrate the dramatic difference between isotopologues in the region of the A-state. These measurements, together with the measured photoelectron angular distributions, provide new insight into the non-adiabatic couplings of ethyny.
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