期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.063003
关键词
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Filaments produced in air by intense femtosecond laser pulses emit UV luminescence from excited N-2 and N-2(+) molecules. We report on a strong dependence at high intensities (I >= 1.4 x 10(14) W/cm(2)) of this luminescence with the polarization state of the incident laser pulses. We attribute this effect to the onset of new impact excitation channels from energetic electrons produced with circularly polarized laser pulses above a threshold laser intensity.
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