We also thank Duane Enderle and Steve Runkles for the construction of vacuum chambers. ... T. J. Quinn and J. E. Martin, aquot;A radiometric determination of the Stefan-Boltzmann constant and thermodynamic temperature between -40 ... 250- 41 (1997). 10. See, for example, G. Margaritondo, Introduction to Synchrotron Radiation 1 January 1999 / Vol. ... Filter Energy Energy Lines to Target Thickness Ka Kfi /fa.