Hydrogen Atomic Motions in Different Intramolecular Environments: H₂O, H₂S, and Formaldehyde (H₂CO)

Area of Science:

• Chemical Physics
• Molecular Spectroscopy
• Quantum Mechanics

Background:

• Molecular motion is typically studied via collective spectroscopic methods.
• Investigating individual atomic motion offers deeper chemical insights.
• Atomic momentum spectroscopy (AMS) is a promising technique for probing specific atomic movements.

Purpose of the Study:

• To demonstrate the sensitivity of AMS in probing atomic motion.
• To benchmark theoretical models of atomic motion in different chemical environments.
• To explore the potential of AMS for analyzing intra-molecular atomic dynamics.

Main Methods:

• High-energy electron back-scattering experiments were conducted.
• Experiments focused on hydrogen (H) atom motion in water (H2O), hydrogen sulfide (H2S), and formaldehyde (H2CO).
• Theoretical calculations were performed to model hydrogen atom motion.

Main Results:

• Experimental data showed good agreement with theoretical predictions.
• Distinct variations in hydrogen atom motion were observed across the studied chemical series.
• The sensitivity of AMS to the chemical environment was clearly demonstrated.

Conclusions:

• AMS is a powerful and sensitive technique for investigating specific atomic motion.
• The study validates theoretical approaches to describing atomic motion.
• AMS has significant potential for advancing the understanding of molecular dynamics and chemical bonding.