| 摘要 |
A cold trap for use in a high vacuum system to analyze the vapor component or components of the gases in, or introduced into, the vacuum system, including the assessment of the partial pressure of any specific component which may be present in the said gases, comprising a chamber closed at its upper end by a thin metallic diaphragm dished inwardly to receive a liquid coolant such as liquid nitrogen, an outlet to interconnect the chamber with a high vacuum system, and means to introduce successive doses of liquid coolant into the diaphragm. This construction allows the trap to be rapidly cycled. It is shown to be advantageous for the radius of curvature of the lowest part of the diaphragm to be such that the area of the diaphragm which remains at the temperature of the coolant until all the coolant has evaporated is larger than the effective area of the outlet.
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