@article {2632, title = {Improved C- efficiency and ion beam currents by modifying SNICS cathode material}, journal = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms}, volume = {439}, year = {2019}, month = {Jan-01-2019}, pages = {90 - 93}, abstract = {We investigated the possibility of increasing the C-14 AMS efficiency and maximizing C- beam currents by modifying sample cathode geometry and material. Previously, we reported results which showed an increase in C- beam current and improved ionization efficiency when reducing the cathode sample well diameter from 1 mm to 0.75 mm and using zinc inserts, pressed into the aluminum cathode holder [4]. In this study we expand that effort by using cathodes with inserts made of Fe, Mo, Ni, Ti, Cu, and Zn. We pressed cathodes with 100 mu g of Oxalic Acid I (OX-I) and ran them to exhaustion. C-12 beam currents, C-14 counts, and graphite weight were used to determine ion source efficiency.}, keywords = {Cathode, Efficiency, Ion source, SNICS}, issn = {0168583X}, doi = {10.1016/j.nimb.2018.11.015}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2\&SrcAuth=Alerting\&SrcApp=Alerting\&DestApp=WOS_CPL\&DestLinkType=FullRecord\&UT=WOS:000455693100015}, author = {Hlavenka, Joshua D. and Abrams, Henry and Roberts, Mark L. and Longworth, Brett E. and Fallon, Stewart} }