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Excess electrons bound to H₂S trimer and tetramer clusters.

Gaoxiang Liu¹, Manuel Díaz-Tinoco², Sandra M Ciborowski¹

¹Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA. kbowen@jhu.edu.

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|February 1, 2020

Summary

This summary is machine-generated.

Researchers prepared and studied hydrogen sulfide trimer and tetramer anions. These molecules are confirmed as dipole-bound anions due to structural changes induced by an excess electron.

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Area of Science:

Physical Chemistry
Chemical Physics
Quantum Chemistry

Background:

Hydrogen sulfide (H2S) clusters are of interest for understanding intermolecular forces.
Investigating the properties of anionic clusters provides insights into electron binding mechanisms.

Purpose of the Study:

To synthesize and characterize hydrogen sulfide trimer and tetramer anions, (H2S)3- and (H2S)4-.
To determine if these anions are dipole-bound and understand the factors contributing to their stability.

Main Methods:

Anion photoelectron spectroscopy was used to measure the binding energies of electrons.
High-level quantum chemical calculations were employed to interpret spectral data and model molecular structures.

Main Results:

The photoelectron spectra revealed sharp peaks at low electron binding energies, characteristic of dipole-bound anions.
Quantum chemical calculations indicated that excess electrons induce structural distortions in (H2S)3 and (H2S)4 clusters.
These distortions enhance charge-dipolar attraction, facilitating electron binding.

Conclusions:

The hydrogen sulfide trimer and tetramer anions, (H2S)3- and (H2S)4-, are confirmed as dipole-bound anions.
Electron-induced structural distortions play a crucial role in the stability of these anionic clusters, overcoming small neutral dipole moments.