Temperature programmed desorption (TPD) has been used to investigate the behavior of cyclohexane (C6H12) on Zr(0001) and the effects of 500 eV electron bombardment on its desorption characteristics. Following adsorption at 150 K, molecular desorption above 600 K suggests exceptionally strong interaction between C6H12 and Zr(0001). These high-temperature desorption features shift to higher temperatures with increasing exposure. Electron bombardment alters TPD profiles and results in small quantities of H-2 desorption from C6H12/Zr(0001) at about 310 K. (c) 2005 American Vacuum Society.