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Updated: Jan 16, 2026

Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry
Published on: March 1, 2020
Spectroscopic Determination of Sequential Desorption Energies from Aromatic Surfaces
Muhammed Shabeeb1, Simran Baweja1, Satish Bhusan Panda1
1Department of Chemistry, IIT Hyderabad, Kandi, Sangareddy 502284, India.
Abstract:
We have presented a mass-selective electronic spectroscopy approach to experimentally determine the sequential desorption energies of rare gas atoms from noncovalently bound complexes in the gas phase. Using the resonant two-photon ionization (R2PI) spectroscopy, the disappearance of Franck-Condon active vibrational bands was probed to indicate the desorption threshold in the excited state directly. The single Ar atom desorption energies from Np-Ar, Np-Ar2, and Np-Ar3 complexes were measured as 522 ± 20, 522 ± 20, and 489 ± 53 cm-1, and for NpOH-Ar, NpOH-Ar2, and NpOH-Ar3 were 484 ± 8, 572 ± 20, and 461 ± 41 cm-1, respectively. The corresponding ground-state desorption energies are found to be 10-17 cm-1 lower, indicating higher adsorption efficiency upon electronic excitation. We further analyzed the impact of substitution, insertion, and ring expansion on adsorption strength. This method offers a versatile and precise spectroscopic tool for quantifying physisorption energies and provides molecular-level insight for designing efficient aromatic adsorbents via noncovalent interactions.
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