Accession Number : AD0625839

Title :   THE MIKER TECHNIQUE.

Descriptive Note : Doctoral thesis,

Corporate Author : OKLAHOMA STATE UNIV STILLWATER

Personal Author(s) : Bennett, James Edward

Report Date : MAY 1965

Pagination or Media Count : 125

Abstract : 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.

Descriptors :   *KNUDSEN NUMBER, *VAPOR PRESSURE, *MOLECULAR WEIGHT, TEST METHODS, DETERMINATION, METAL VAPORS, PHYSICAL PROPERTIES, HIGH TEMPERATURE, BALANCES, GAS FLOW, ORIFICES, QUARTZ, TIN, FORCE(MECHANICS), CALCIUM, FLUORIDES, GOLD, GRAPHITE, MOMENTUM, LEAST SQUARES METHOD, MOLECULAR BEAMS.

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE