低气压Ar-Hg放电中的185nm辐射

185 nm Radiation in Low Pressure Ar-Hg Discharge

185nm辐射在污染处理中有许多潜在的应用.用模型计算了内径分别为36,24,13,9.5mm的放电管中,低气压Ar Hg放电的185nm辐射功率和Hg(61P1)能级浓度随电流和管壁温度的变化,与己有的实验值符合较好.结果表明,要提高185nm辐射效率,需采用细管径放电管并在较大电流和较高管壁温度下工作.在此基础上设计、制作了内径13mm放电管,测量了185,254nm的绝对辐射功率.测得在电流543mA、管壁温度45℃时,185nm与254nm辐射的功率之比为0.28.讨论了测量的误差来源.

185 nm radiation has many potential applications to the pollution treatment. The 185 nm radiation power and Hg(6~1P_1) state density are calculated for model discharge tubes with inner diameter of 36,24,13 and 9.5 mm respectively at different discharge currents and wall temperatures. The results are in good agreement with the published experimental results. It is shown that smaller diameter, higher current density and higher wall temperature are necessary to increase the 185 nm radiation efficiency. Based on these results, a new discharge lamp with 13 mm inner diameter is designed and manufactured, for which the absolute radiation powers of 185 and 254 nm are measured. The ratio of 185 to 254 nm radiation power is 0.28 for discharge conditions of current 543 mA and wall temperature 45 ℃. The origin of measurement error is discussed in detail.