Hi to All, The liquid nitrogen system is still down and unfortunately I do not know for how long but I do know it will be for an extended period of time before we will be operational. I do expect to have an answer by early next week and will keep you updated. In the mean time I will have supplies for the evaporators and some small quantities as needed to keep everyone going. Please contact me for specific needs or you can order your own if you wish from a vendor or at Physics they have a supply on hand Thanks for your patience, Kenny Kenny Schwartz Birck Nanotechnology Center Purdue University PH 765-496-1174