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Chirped pulse multiphoton ionization of nitrogen: Control of selective rotational excitation in
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View: Figures


Image of FIG. 1.
FIG. 1.

Fluorescence spectrum of recorded after interaction with a 804 nm 85 fs laser pulse. The indicated vibrational transitions are assigned to the first negative band system of ( transition). The dominant vibrational transitions are indicated, where and denote the vibrational levels of the upper and lower cation states, respectively. Inset: vibrational distribution of obtained from the fluorescence spectrum (gray bars). For a comparison, the vibrational distribution for direct photoionization is included (black bars) (Ref. 31).

Image of FIG. 2.
FIG. 2.

Fluorescence spectra of ( transition) recorded with a different linear chirp of the 804 nm pulse: (a) , (b) , (c) transform-limited pulse (85 fs pulse duration), (d) , and (e) . The -levels of the rotational lines of the -branch are indicated. The intensity alternation of the rotational lines is a result of the relative abundance of ortho- and para-.

Image of FIG. 3.
FIG. 3.

Fluorescence intensity of as a function of the linear chirp of the 804 nm femtosecond laser pulse (full circles). The solid line shows the calculated intensity as a function of pulse duration assuming a nonresonant ionization process for a transform limited pulse. For further details see text.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Chirped pulse multiphoton ionization of nitrogen: Control of selective rotational excitation in N2+(B Σ2u+)