TY - JOUR
T1 - The influence of molecular gases and analytes on excitation mechanisms in atmospheric microwave sustained argon plasmas
AU - Timmermans, E.A.H.
AU - Thomas, I.A.J.
AU - Jonkers, J.
AU - Hartgers, A.
AU - Mullen, van der, J.J.A.M.
PY - 1998
Y1 - 1998
N2 - The effect of introducing molecular compounds
into argon plasmas has been studied using an expanding
microwave induced plasma at atmospheric pressure. Besides
the use of optical emission spectroscopy (OES), also
the time dependent behavior of line intensities during power
interruptions has been studied. From the measurements it
is found that even an injection of small amounts of molecular
compounds (> 0.5%) leads to important changes in
excitation mechanisms in the plasma. It is also found that
in the recombination zone downstream in the plasma an
excitation mechanism which is independent of the electron
density, e.g. excitation transfer from metastables or
Penning ionization, must be responsible for the excitation
of analytes.
AB - The effect of introducing molecular compounds
into argon plasmas has been studied using an expanding
microwave induced plasma at atmospheric pressure. Besides
the use of optical emission spectroscopy (OES), also
the time dependent behavior of line intensities during power
interruptions has been studied. From the measurements it
is found that even an injection of small amounts of molecular
compounds (> 0.5%) leads to important changes in
excitation mechanisms in the plasma. It is also found that
in the recombination zone downstream in the plasma an
excitation mechanism which is independent of the electron
density, e.g. excitation transfer from metastables or
Penning ionization, must be responsible for the excitation
of analytes.
U2 - 10.1007/s002160051104
DO - 10.1007/s002160051104
M3 - Article
SN - 0937-0633
VL - 362
SP - 440
EP - 446
JO - Fresenius' Journal of Analytical Chemistry
JF - Fresenius' Journal of Analytical Chemistry
IS - 5
ER -