Resonance-enhanced above-threshold ionization of ammonia under strong fields
Ignacio M. Casasús, María E. Corrales, Arlind Sherifi, Sonia Marggi Poullain, Luis Bañares · 2026
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Description
Ignacio Casasús and co-authors watch ammonia molecules break apart under intense laser light and find a hidden resonance steering the process. When strong fields tear electrons from molecules, the electrons can carry extra energy in steps, a process called above-threshold ionization. Resonant versions were well known in atoms but not in many-atom molecules. Their 2026 study uses short 800-nanometer pulses and images the escaping electrons.
Ammonia has a telling vibration, an umbrella bending motion, that marks its energy states. A weak resonance, shifted by the strong field itself, turned out to spawn copies that outshone the main ionization channel. That makes this a clear case of resonance-enhanced ionization in a polyatomic molecule. The authors draw a single map linking plain, resonant, and above-threshold paths, and offer ammonia as a test case for strong-field studies.
Catalog record
| CREATOR | Ignacio M. Casasús, María E. Corrales, Arlind Sherifi, Sonia Marggi Poullain, Luis Bañares |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 58 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |