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The Miker Technique

出版	Oklahoma State University, 1965
URL	http://books.google.com.hk/books?id=ByLbXwAACAAJ&hl=&source=gbs_api

註釋A new momentum recoil technique has been developed for determining the vapor pressure and average molecular weight of the high temperature, low pressure vapor species. The Microbalance-Inverted Knudsen Effusion Recoil technique (the MIKER technique) employs an inverted Knudsen effusion cell with a diverging conical orifice. The construction of a special vacuum microbalance for the Miker technique is described. The average molecular weight of silver vapor at about 1325K was 62 = 5 (quartz effusion cell) and 73 = 5 (graphite cell). The average molecular weight of tin vapor over the range 1332 - 1504K was 92 = 14. The average molecular weight of calcium fluoride vapor over the range 1521 - 1707K was 77 = 7. The vapor pressure of gold from rate of effusion measurements over the range 1533 - 1673K yields a least squares solution of log P = 7.0184 - 19964/T. Determinations with a sample-blocked orifice yielded an unexpected logarithmic temperature effect on the recoil force. An analysis is presented which corrects for effusion which occurs during the cooling period of the effusion cell.