Patent Number: 
Section: claims

1. A bonded article comprising: a single crystal cathode; and  a member, bonded to said substantially single crystal cathode such that a single crystalline structure of the single crystal cathode is preserved after bonding. 2. The bonded article of  claim 1 , said single crystal cathode having reduced structural and emissive non-uniformities. claim 1 3. The bonded article of  claim 1 , wherein said single crystal cathode is made of tantalum. claim 1 4. The bonded article of  claim 3 , wherein an emissive plane of said substantially single crystal cathode has a relatively low work function. claim 3 5. The bonded article of  claim 4 , wherein the emissive plane is the (111) plane. claim 4 6. The bonded article of  claim 4 , wherein the emissive plane is the (100) plane. claim 4 7. The bonded article of  claim 1 , wherein said single crystal cathode is a refractory crystalline material or alloy with a relatively low work function. claim 1 8. The bonded article of  claim 1 , wherein said single crystal cathode is part of a projection electron lithography system. claim 1 9. The bonded article of  claim 8 , wherein the projection electron lithography system is a SCALPEL(trademark) system. claim 8 10. A method of bonding a single crystal cathode, having a grain structure, to a member, comprising: obtaining the single crystal cathode;  obtaining the member; and  bonding the single crystal cathode and the member together by a local bonding technique, such that a single crystalline structure of the single crystal cathode is preserved after bonding. 11. The method  claim 10 , wherein the local bonding technique is laser welding. claim 10 12. The method of  claim 10 , wherein the single crystal cathode has reduced structural and emissive non-uniformities. claim 10 13. The method of  claim 10 , wherein the single crystal cathode is made of tantalum. claim 10 14. The method of  claim 13 , wherein an emissive plane of said single crystal cathode has a relatively low work function. claim 13 15. The method of  claim 14 , wherein the emissive plane is the (111) plane. claim 14 16. The method of  claim 14 , wherein the emissive plane is the (100) plane. claim 14 17. The method of  claim 10 , wherein the single crystal cathode is a refractory crystalline material or alloy with a relatively low work function. claim 10 18. The method of  claim 10 , wherein the single crystal cathode is part of a projection electron lithography system. claim 10 19. The method of  claim 18  wherein the projection electron lithography system is a SCALPEL(trademark) system. claim 18 20. The method of  claim 10 , wherein the member is a filament, made of one of tungsten, a tungsten-rhenium alloy, and a tungsten-tantalum alloy. claim 10 21. The bonded article of  claim 1 , wherein the member is a filament, made of one of tungsten, a tungsten-rhenium alloy, and a tungsten-tantalum allow. claim 1