In:
Physics of Plasmas, AIP Publishing, Vol. 23, No. 2 ( 2016-02-01)
Abstract:
We experimentally measure the angular distribution of plasma luminescence emission during the filamentation of linearly polarized femtosecond laser pulses. It is found that the luminescence from N2 shares the same intensity in all directions, while that from N2+ is more intense in the direction parallel to that of the laser polarization. The isotropic emission behavior of luminescence from N2 illustrates that the formation of excited N2(C3Πu+) does not result from the dissociative recombination; on the other hand, the linear increase of the strength of 337 nm signal with pressure indicates that the collision plays a negligible role, excluding the collision assisted intersystem crossing scheme. However, the intersystem crossing does not rely on the collision, making it a possible scheme. This study will be helpful to the understanding of mechanism of plasma luminescence emission during femtosecond filamentation.
Type of Medium:
Online Resource
ISSN:
1070-664X
,
1089-7674
Language:
English
Publisher:
AIP Publishing
Publication Date:
2016
detail.hit.zdb_id:
1472746-8
