About Our Group:

We design, build and exploit new types of instruments that provide qualitatively new pictures of how chemical reactions occur. By coupling mass-selective vibrational spectroscopy with cryogenic ion processing, we are able to study a wide variety of chemical phenomena, including small molecule activation, gas-liquid interfacial chemistry, and intracluster hydrogen bonding.


May 16, 2023
Thien judged the 28th Annual New Haven Science Fair. This was his fourth and last time serving as a judge. It was bittersweet, but he was impressed still with the quality of...
May 12, 2023
Evan Perez, currently a postdoc at the University of Utah with Peter Armentrout, was awarded the NSF-MPS-Ascend Postdoctoral Fellowship. Tim Guasco, currently a professor at...
May 3, 2023
Thien received the competitive NSF-MPS-Ascend Fellowship, which will fund his postdoctoral research at USC. Additionally, he also received the prestigious Wolfgang Prize...

Selected Publications:

Deconstructing Water’s Diffuse OH Stretching Vibrational Spectrum with Cold Clusters

Spectroscopic Snapshots of the Proton-transfer Mechanism in Water

Capture of CO2 by a Cationic NiI Complex in the Gas Phase and Characterization of the Bound Activated CO2 Molecule through Cryogenic Ion Vibrational Predissociation Spectroscopy

Vibrational spectral signature of the proton defect in the three-dimensional H+(H2O)21 cluster

Modes of Activation of Organometallic Iridium Complexes for Catalytic Water and C-H Oxidation