Diagnostics of low-frequency ch4 and h2 discharge by optical emission spectroscopy

T. Kokubo, F. Tochikubo, T. Makabe

研究成果: Article査読

23 被引用数 (Scopus)


Low–frequency glow discharge for the deposition of hydrogenated amorphous carbon has been investigated by using time– and space–resolved emission spectroscopy as the parameters of pressure (0.3and<pand<3.0 Torr) and gas mixture ratio between CH4 and H2 at 100 kHz and 10 SCCM. The authors ascertain the temporal structure of the discharge. The CH(B2 Sigma ; v’=0 to X2 Pi; v”=0) band head in CH4/H2 is selected as a probe for monitoring the dynamics of the electron transport. The Ar I (3p55p:3p1 to 3p54s:1s2) line in pure Ar is also observed for comparison with the discharge structure in CH4/H2. The glow discharge property changes significantly with total gas pressure in the CH4/H2 mixture under investigation. Considerable variation is observed between the sustaining voltage and the emission profile of the discharge with the increase of mixture ratio of CH4 to H2 at constant power. Remarkable differences in the emission profile exist between CH4/H2 and Ar. The authors show that the drift velocity of the dominant ions plays an important role in deciding the structure of the discharge especially at low frequency, and that the plasma bulk potential in Ar is higher than that in H2 at the same applied voltage.

ジャーナルJournal of Physics D: Applied Physics
出版ステータスPublished - 1989 9月 14

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 音響学および超音波学
  • 表面、皮膜および薄膜


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