Publication detail

Post-discharges in Pure nitrogen and in Nitrogen Containing Halogenated Hydrocarbon Traces

KRČMA, F., PROTASEVICH, E.

Original Title

Post-discharges in Pure nitrogen and in Nitrogen Containing Halogenated Hydrocarbon Traces

English Title

Post-discharges in Pure nitrogen and in Nitrogen Containing Halogenated Hydrocarbon Traces

Type

book

Language

en

Original Abstract

The work presents the results obtained during the spectroscopic observations of post-discharges of the pure nitrogen plasmas and nitrogen plasmas containing traces of hydrocarbons and halogenated hydrocarbons. The DC and microwave discharges have been used for plasma generation. The plasma have been studied by the emission spectroscopy of three nitogen and two CN spectral systems. The N2(B)N2(C)and N2+(B)vibrational distributions have been studied as a function of decay time at wall temperatures in the interval of 77-300 K in the pure nitrogen DC afterglow. The quenching of the nitrogen pink afterglow by the hydrocarbon traces was directly studied and it was shown that the maximum of the pink afterglow intensity is decreasing proportionaly to the increase of the methane concentration. The position of the maximum emission is also lineary shifted to the later decay times. The vibrational distributions of N2(B)and CN(A) states have been studied as a function of the methane concentration at six selected decay times at wall temperatures of 77 K and 300 K. The influence of hydrocarbon presence on the other observed spectral systems was studied at the same experimental conditions throug the selected band, only, due to the strong overlapping of these systems. The strong CN violet system emission was measured at higher hydrocarbon concentrations, especialy at the wall temperature of 77 K. Due to the very high sensitivity to the methane presence a new method of hydrocarbon traces detection in pure nitrogen was proposed and further developed. For its application in determination of the polymer material destruction the influence of various partially or fully halogenated hydrocarbons was verified. The detection limit of this method is about 0.05 ppm of carbon atoms in the pure nitrogen. The direct measurements of the destruction of polyethylene and polypropylene samples were presented. On the base of the experimental results, the appropriate kinetic model of the plasma excited in pure nitrogen and in nitrogen with carbon containing traces was designed. The specific state-to-state energy transfer reactions among the studied states and nitrogen vibrationally excited ground state are presented.

English abstract

The work presents the results obtained during the spectroscopic observations of post-discharges of the pure nitrogen plasmas and nitrogen plasmas containing traces of hydrocarbons and halogenated hydrocarbons. The DC and microwave discharges have been used for plasma generation. The plasma have been studied by the emission spectroscopy of three nitogen and two CN spectral systems. The N2(B)N2(C)and N2+(B)vibrational distributions have been studied as a function of decay time at wall temperatures in the interval of 77-300 K in the pure nitrogen DC afterglow. The quenching of the nitrogen pink afterglow by the hydrocarbon traces was directly studied and it was shown that the maximum of the pink afterglow intensity is decreasing proportionaly to the increase of the methane concentration. The position of the maximum emission is also lineary shifted to the later decay times. The vibrational distributions of N2(B)and CN(A) states have been studied as a function of the methane concentration at six selected decay times at wall temperatures of 77 K and 300 K. The influence of hydrocarbon presence on the other observed spectral systems was studied at the same experimental conditions throug the selected band, only, due to the strong overlapping of these systems. The strong CN violet system emission was measured at higher hydrocarbon concentrations, especialy at the wall temperature of 77 K. Due to the very high sensitivity to the methane presence a new method of hydrocarbon traces detection in pure nitrogen was proposed and further developed. For its application in determination of the polymer material destruction the influence of various partially or fully halogenated hydrocarbons was verified. The detection limit of this method is about 0.05 ppm of carbon atoms in the pure nitrogen. The direct measurements of the destruction of polyethylene and polypropylene samples were presented. On the base of the experimental results, the appropriate kinetic model of the plasma excited in pure nitrogen and in nitrogen with carbon containing traces was designed. The specific state-to-state energy transfer reactions among the studied states and nitrogen vibrationally excited ground state are presented.

Keywords

Nitrogen post-discharge, kinetic processes, polzmer disintegration, molecular spectrosopy

RIV year

2003

Released

20.09.2003

Publisher

1

Location

Tomsk, Rusko

ISBN

1898326444

Book

Post-discharges in Pure nitrogen and in Nitrogen Containing Halogenated Hydrocarbon Traces

Pages from

1

Pages to

128

Pages count

128

BibTex


@book{BUT61742,
  author="František {Krčma} and Evgenij {Protasevich}",
  title="Post-discharges in Pure nitrogen and in Nitrogen Containing Halogenated Hydrocarbon Traces",
  annote="The work presents the results obtained during the spectroscopic
observations of post-discharges of the pure nitrogen plasmas and
nitrogen plasmas containing traces of hydrocarbons and halogenated
hydrocarbons.  
The DC and microwave discharges have been used for plasma generation.
The plasma have been studied by the emission spectroscopy of three nitogen
and two CN spectral systems.

The N2(B)N2(C)and N2+(B)vibrational distributions 
have been studied as a function of decay time at wall
temperatures in the interval of 77-300 K in the pure nitrogen DC afterglow.

The quenching of the nitrogen pink afterglow by the hydrocarbon traces was
directly studied and it was shown that the maximum of the pink afterglow
intensity is decreasing proportionaly to the increase of the methane
concentration. The position of the maximum emission is also lineary
shifted to the later decay times.
The vibrational distributions of N2(B)and CN(A) states have been
studied as a function of the methane concentration at six selected decay
times at wall temperatures of 77 K and 300 K. 
The influence of hydrocarbon presence on the other
observed spectral systems was studied at the same experimental conditions
throug the selected band, only, due 
to the strong overlapping of these systems. The strong CN violet system
emission was measured at higher hydrocarbon concentrations, especialy at
the wall temperature of 77 K. 

Due to the very high sensitivity to the methane presence a new method of
hydrocarbon traces detection in pure nitrogen was proposed and further
developed. For its application in determination of the polymer material
destruction the influence of various partially or fully halogenated
hydrocarbons was verified. The detection limit of this method is 
about 0.05 ppm of carbon atoms in the pure nitrogen. The direct
measurements of the destruction of polyethylene and polypropylene samples
were presented. 

On the base of the experimental results, the appropriate kinetic model 
of the plasma excited in pure nitrogen and in nitrogen with carbon
containing traces was designed. The specific state-to-state energy
transfer reactions among the studied states and nitrogen vibrationally
excited ground state are presented.",
  address="1",
  booktitle="Post-discharges in Pure nitrogen and in Nitrogen Containing Halogenated Hydrocarbon Traces",
  chapter="61742",
  institution="1",
  year="2003",
  month="september",
  pages="1",
  publisher="1",
  type="book"
}