500 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1954 



Briggs, H. B.,1 and R. C. Fletcher.^ 



Absorption of Infrared Light by Free Carriers in Germanium, Phys. 

 Rev., 91, pp. 1342-1346, Sept. 15, 1953. 



The absorption of infrared light associated with the presence of free carriers 

 in germanium has been measured by injecting these carriers across a p-n 

 junction at i-oom temperature. The absorption is found to be proportional 

 to the concentration of carriers. The absorption as a function of wave- 

 length shows the same rather sharp maxima previousl}' ol^served in normal 

 p-type germanium. These l)ands are found to change with temi)eratuie. 

 An explanation of this absorption is offei-ed in terms of a degenerate energy 

 band scheme. 



Briggs, H. B., see M. Tanenbaum. 



Carlitz, L.,1 and J. Riordan.^ 



Congruences for Eulerian Numbers, Duke Math. J., 20, pp. 339-343, 

 Sept., 1953. 



Clark, M. A., see H. C. Montgomery. 



Crabtree, J.,1 and B. S. Biggs. ^ 



Cracking of Stressed Rubber by Free Radicals, Letter to the Editor, 

 J. Polymer Sci., 11, pp. 280-281, Sept., 1953. 



Dickinson, F. R., see L. H. Morris. 



Felch, E. P.,^ and J. L. Potter.^ 



Preliminary Development of a Magnettor Current Standard, A.LE.E. 

 Trans., Commun. c^' Elec, 9, pp. 524-531, Nov., 1953. 



In the wartime development of the air-liorne magnetometer, a method of 

 detecting extremely small changes in magnitudes of magnetic fields was 

 developed. The principle involved was the use of a second-harmonic type 

 of magnetic modulator now known as a magnettor. Tliis instrument can 

 detect changes in magnetic fields in the order of 10"^ oersted. A study was 

 made at Rutgers University under the sponsorship of Bell Telei)lK)ne Labo- 

 ratories to detei'mine the feasibility of obtaining a standard of curi'ent using 

 the magnettor ])rinciple. 



Fletcher, R. C, see H. B. Briggs. 



1 Bell Telephone Laboratories, Inc. 



