We have studied on a cold-CO
2plasma in a Penning-type rf-glow discharge tube (13.56 MHz) for a gas pressure ranged from 2 to 133 Pa by using optical emission spectroscopy and quadrapole mass spectrometry. It was found that the discharge power to sustain a glow discharge varied with the gas pressure similar to the Paschen's law on a sparking voltage. The minimum rf-power was found at 10Pa. The optical emission spectroscopy and the quadrapole mass spectrometry showed ionization of CO
2 was predominant at a low gas pressure region below the minimum discharge gas pressure of 10 Pa. While, the dissociation of CO
2 was predominant at a high gas pressure region above the minimum gas pressure of 10 Pa. The addition of H
2 into the CO
2 plasma in the high gas pressure region produced C
nH
x such as CH
3 and C
2H
3 at a room temperature. The glow discharge plasma has a potential for a fixing and/or control of CO
2 greenhouse gas under a low power consumption.
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