Russian Physics Journal, Vol. 60, No. 4, August, 2017 (Russian Original No. 4, April, 2017)
FORMATION OF NITROGEN OXIDES IN AN APOKAMP-TYPE
É. A. Sosnin,
P. A. Goltsova,
V. A. Panarin,
V. S. Skakun,
V. F. Tarasenko,
and M. V. Didenko
Using optical and chemical processes, the composition of the products of decay of the atmospheric-pressure
non-equilibrium plasma is determined in a pulsed, high-voltage discharge in the modes of apokampic and
corona discharges. It is shown that the products of decay primarily contain nitrogen oxides NO
, and in the
mode of the corona discharge – ozone. Potential applications of this source of plasma are discussed with
respect to plasma processing of the seeds of agricultural crops.
Keywords: apokamp, pulsed discharge, corona discharge, plasma treatment, nitrogen oxides.
At present, processing by non-equilibrium atmospheric-pressure plasma and the products of its decay has found
numerous applications in biomedicine, food industry, and modification of materials [1–3]. A comparatively new field of
investigations is the pre-seeding treatment of the seeds of agricultural crops, which, according to the experiments,
favorably affects their germination, germinating capacity, and seed yield, and promotes funginertness of agricultural
crops and their resistance to bacterial diseases [3–7]. A successful application of this processing requires more detailed
investigations of the composition of plasma generated in pulsed and continuous discharges, as well as the products of its
decay; all the more so as every plasma source possesses a unique set of the products. While it is well known that pulsed
discharges in atmospheric-pressure air are sources of nitrogen oxides [3, 8], it is nevertheless necessary to certify the
source in every particular case in order understand the extent to which it satisfies a particular task.
The aim of this work is to determine the composition of plasma of a repetitively-pulsed high-voltage discharge
burning in the apokampic mode, which was discovered and described in [9, 10]. This is a new plasma source differing
from the other pulsed discharges by the formation of one or more plasma jets (apokamps, in Greek: από – from and
καμπη – bend, turning) at the bend of the current-conducting channel, which propagate normal to the discharge channel
without gas flushing and have a length of up to a few centimeters.
A photo of this phenomenon is shown in Fig. 1. An apokamp 4 is formed as an extension of the bright shoot 3
in the bend of the discharge channel 1. The halo 2 represents hot gas, though in general the orientation of an apokapm is
not related to the processes of hot gas convection .
In [10, 11], it was shown that the emission spectrum of the apokamp and that of the discharge initiating it in air
under standard conditions contains more bands and lines than the spectrum of a corona discharge, the highest band
intensity demonstrated by the nitrogen molecule and molecular ion bands: N
). There are no literature data on the composition of the plasma decay products though.
Institute of High Current Electronics of the Siberian Branch of the Russian Academy of Sciences, Tomsk,
Russia, e-mail: email@example.com; firstname.lastname@example.org; email@example.com; firstname.lastname@example.org;
Research Tomsk State University, Tomsk, Russia, e-mail: email@example.com; firstname.lastname@example.org. Translated
from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 126–130, April, 2017. Original article submitted
January 17, 2017.
1064-8887/17/6004-0701 2017 Springer Science+Business Media New York