Evacuated and cooled diffraction chamber for electron diffraction apparatus

Claim 1

IN APPARATUS FOR RECORDING ELECTRON DIFFRACTION PATTERNS, THE COMBINATION COMPRISING A VACUUM TUBE HAVING CATHODE AND CONDENSER MEANS, VACUUM PUMP MEANS FOR EVACUATING SAID VACUUM TUBE, SAID VACUUM TUBE INCLUDING A DIFFRACTION CHAMBER AND A RECORDING CHAMBER, AN INNER CHAMBER DISPOSED WITHIN SAID DIFFRACTION CHAMBER AND HAVING CHAMBER WALLS ADAPTED TO SURROUND A SEPCIMEN TO BE EXAMINED, COOLING MEANS FOR COOLING SAID INNER CHAMBER, MEANS DEFINING A PAIR OF ALIGNED OPENINGS IN SAID INNER CHAMBER WALLS FOR THE PASSAGE OF A DIFFRACTING AND DIFFRACTED ELECTRON BEAM, MEANS DIFINING A PLURALITY OF APERTURES IN SAID INNER CHAMBER WALLS, A SPECIMEN HOLDER DISPOSED IN ONE OF SAID APERTURES, A DISCHARGING ELECTRON BEAM DEVICE DISPOSED IN ANOTHER OF SAID APERTURES, AN ION BEAM DEVICE DISPOSED IN ANOTHER ONE OF SAID APERTURES, A MOLECULAR BEAM DEVICE DISPOSED IN A FURTHER ONE OF SAID APERTURES, SAID PAIR OF OPENINGS AND SAID PLURALITY OF APERTURES BEING ARRANGED RELATIVE TO EACH OTHER SO THAT THEY ARE DIRECTED TOWARD A SPECIMEN ON SAID SPECIMEN HOLDER, SAID SPECIMEN HOLDER BEING DISPOSED IN NON-HEAT TRANSFER RELATIONSHIP WITH SAID INNER CHAMBER WALLS, AND SECOND VACUUM PUMP MEANS OPERATIVELY CONNECTED TO SAID INNER CHAMBER WHEREBY SAID INNER CHAMBER IS EVACUATED TO A HIGHER VACUUM THAN SAID DIFFRACTION CHAMBER.