https://doi.org/10.1140/epjd/e2005-00181-x
The study of dominant physical processes in the time-resolved optogalvanic spectra of neon
Atomic and Molecular Physics Laboratory, Department of Physics,
Quaid-i-Azam University, Islamabad 45320, Pakistan
Corresponding author: a baig@qau.edu.pk
Received:
10
November
2004
Revised:
10
March
2005
Published online:
12
July
2005
We present the dominant physical processes responsible for the production of
the optogalvanic signal in the spectra of neon. We have investigated the
effects on the optogalvanic signal by scanning a dye laser across the neon
transitions in the DC discharge plasma. Time-resolved spectra are obtained
at a fixed wavelength of the dye laser resonantly tuned to an optically
allowed transition. The temporal evolutions of the signals are registered on
a storage oscilloscope. Three transitions from the 3s[1/2]2 metastable
state corresponding to the , ±1 dipole
selection rules have been selected to investigate the dominant physical
processes responsible for the optogalvanic signals. The change in the signal
amplitude as a function of the discharge current has been
registered. In addition the electron collisional ionization rate
parameter ratios have been determined for the transitions corresponding to
dipole selection rules
,
and
, as 1.63, 1.75 and 1.0 respectively. The
effective lifetimes of the upper levels involved in the aforementioned
transitions are also calculated as 62.5
s, 31.25
s and 12.85
s respectively.
PACS: 32.30.Jc – Visible and ultraviolet spectra / 32.80.Rm – Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005