Kodak used to make ektachrome infrared film. Going through my archives I found several images shot on this film. My understanding there is only one place to get such film today and it is available only in 120 size and its expensive. Check out http://www.tarquinius.de/
You can take infrared photos with a digital camera but you will not get these results. Its too bad this film has been discontinued. Black and white infrared is still made by a number of companies. Freestyle out of California http://www.freestylephoto.biz sells Efke ,Rollei, and Ilford B&W infrared in 35 mm and 120 size film. Most of these films require a dark red filter for dramatic effect. The example below is Efke b&w infrared film. The effect from this filom is not as dramatic. The image was taken with a red filter.
Of course you can shoot infrared with some digital cameras but most have to have some modifications done to them. The images below were done with the Fuji x-100 and an r72 filter which is a very deep red.