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We report on diagnostics of rotational wavepackets coherently generated in strong-field-ionized nitrogen molecules with a seed-amplified air lasing scheme, and the first observation on Raman scattering of neutral nitrogen molecules with such an “air laser”.
Molecular ionization by femtosecond light pulses is fascinating phenomena in terms of both the underlying physics and practical implications to selective control of isomerization and fragmentation pathway(s) through the shape of the optical waveform. Triggered by optical field ionization, the outcome of the complex electronic and subsequent nuclear dynamics leading to fragmentation is to a large extent...
Recently, selective fragmentation of polyatomic molecules using the carrier-envelope phase (CEP) of few-cycle ionizing laser pulses as the control parameter [1] has been demonstrated [2]. It was shown that the underlying mechanism is selective removal of specific (inner-valence shell) electrons, which puts the molecule into a dedicated dissociative electronic state from which the molecule then fragments...
We report on the generation of coherent N2+ emissions in a plasma string driven by two-color laser fields and measure their temporal structures. It is confirmed that the coherent emissions originate from seed-injected amplification.
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