Mid infrared emission spectroscopy of carbon plasma

L. Nemes, Ei Ei Brown, Clayton S.-C. Yang, Uwe Hommerich

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Mid infrared time-resolved emission spectra were recorded from laser-induced carbon plasma. These spectra constitute the first study of carbon materials LIB spectroscopy in the mid infrared range. The carbon plasma was induced using a Q-switched Nd: YAG laser. The laser beam was focused to high purity graphite pellets mounted on a translation stage. Mid infrared emission from the plasma in an atmospheric pressure background gas was detected by a cooled HgCdTe detector in the range 4.4–11.6 μm, using long-pass filters. LIB spectra were taken in argon, helium and also in air. Despite a gate delay of 10 μs was used there were strong backgrounds in the spectra. Superimposed on this background broad and noisy emission bands were observed, the form and position of which depended somewhat on the ambient gas. The spectra were digitally smoothed and background corrected. In argon, for instance, strong bands were observed around 4.8, 6.0 and 7.5 μm. Using atomic spectral data by NIST it could be concluded that carbon, argon, helium and nitrogen lines from neutral and ionized atoms are very weak in this spectral region. The width of the infrared bands supports molecular origin. The infrared emission bands were thus compared to vibrational features of carbon molecules (excluding C2) of various sizes on the basis of previous carbon cluster infrared absorption and emission spectroscopic analyses in the literature and quantum chemical calculations. Some general considerations are given about the present results.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume170
DOIs
Publication statusPublished - Jan 5 2017

Fingerprint

Emission spectroscopy
Infrared spectroscopy
Carbon
Argon
Infrared radiation
Plasmas
carbon
Helium
spectroscopy
argon
Gases
Carbon clusters
helium
Graphite
Lasers
Infrared absorption
Atmospheric pressure
Laser beams
Q switched lasers
neutral atoms

Keywords

  • Carbon
  • Cluster
  • Emission
  • Infrared
  • LIBS
  • Plasma

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Spectroscopy

Cite this

Mid infrared emission spectroscopy of carbon plasma. / Nemes, L.; Brown, Ei Ei; S.-C. Yang, Clayton; Hommerich, Uwe.

In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, Vol. 170, 05.01.2017, p. 145-149.

Research output: Contribution to journalArticle

Nemes, L. ; Brown, Ei Ei ; S.-C. Yang, Clayton ; Hommerich, Uwe. / Mid infrared emission spectroscopy of carbon plasma. In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. 2017 ; Vol. 170. pp. 145-149.
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