Browse Prior Art Database

Vapor Phase Chemical Microprobe

IP.com Disclosure Number: IPCOM000122750D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 55K

Publishing Venue

IBM

Related People

Gregory, TA: AUTHOR [+2]

Abstract

Described is an apparatus which will direct a controlled stream of nitrogen saturated with any desired vapor to a specimen under a microscope objective (with a working distance of at least 0.5 mm). This enables chemical probing of unknown materials at picogram quantities.

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Vapor Phase Chemical Microprobe

      Described is an apparatus which will direct a controlled stream
of nitrogen saturated with any desired vapor to a specimen under a
microscope objective (with a working distance of at least 0.5 mm).
This enables chemical probing of unknown materials at picogram
quantities.

      The apparatus is made of pyrex.  Fig. 1 shows a 24/40 inner
joint 1 with sintered glass rod 2, and nichrome wire 3.  Fig. 2 shows
a 24/40 outer joint 4, vapor delivery tube 5, and nichrome wire 6.
In use, one can have any number of inner joint units, each treated
with a different chemical probe molecule.  The joint with the desired
compound is simply inserted into the outer joint.  Clean nitrogen
flows past the sintered glass rod reservoir, becoming saturated with
the vapor of compound loaded there.  The voltages across the nichrome
wires are adjusted to keep the nitrogen above room temperature.  The
nichrome wire in the delivery tube keeps the vapor warmer than it is
in the saturator. This ensures no condensation in the delivery tube.
When the vapor stream leaves the tip, it has enough momentum to
travel about an inch to the specimen under the microscope objective.
Since the specimen is at room temperature, and the vapor was
saturated above room temperature, liquid condenses on the specimen.
By controlling flow rate with metering valve 7 and regulator 8, and
the temperatures of the nicrome wires, picogram to milligram
quantities of liquid can be c...