ArticleScience advances2025
Waveform-dependent air fluorescence from neutral and ionic nitrogen molecules.
Article in Science advances, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Bright isolated light pulses reaching 18 attoseconds from high-order harmonic generation by post-compressed Yb lasers.Nature communications · 2026Article
- Filamentation-assisted isolated attosecond pulse generation.Nature communications · 2026Article
- A Multifunctional Bioactive Nanoscale Coating Deposited by Atmospheric Pressure Plasma Polymerization of Peppermint Essential Oil.Small (Weinheim an der Bergstrasse, Germany) · 2026Article
- Controlling rotational air lasing lineshape by carrier-envelope offset phase.Nature communications · 2025Article
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Authors and funding
6 authors.
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Abstract
Laser-induced air fluorescence in the ultraviolet regime is primarily attributed to transitions between the C and B states in excited neutral [Formula: see text] molecules and between the B and X states in [Formula: see text] ions. However, the mechanism underlying the former remains contentious, as direct population to the C state by light fields is forbidden by electron spin constraints. In this work, we investigate the mechanism of air fluorescence from excited neutral [Formula: see text] molecules by carrier-envelope phase-stabilized sub-4 femtosecond pulses. Our results show that fluorescence from [Formula: see text] ions reaches a maximum with cosine-like pulses, while fluorescence from excited neutral [Formula: see text] molecules peaks with sine-like pulses. In addition, by scanning the chirp of the driving pulse, we find that ionic fluorescence is maximized with chirp-free pulses, whereas neutral fluorescence favors negatively chirped pulses. These observations, supported by classical trajectory Monte Carlo simulations, support the mechanism of intersystem crossing from excited spin-singlet states, which are populated via recollision-induced strong-field excitation.
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Registered trials
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