Photoconductivity measurements of x-ray absorption of liquids: Fe K-edge spectrum of ferrocene in 2, 2, 4, 2, 4-trimethylpentane

Using a conductivity technique, we have obtained EXAFS spectra of ferrocene Fe(C5H5)2 in 2,2,4-trimethylpentane under various conditions. The behavior of the collection efficiency of the conductivity cell affects the appearance of the photoconductivity spectrum. In thin cells, the photocurrent increases at the K edge and normal EXAFS structure is observed. In the black cell limit, i.e., for total absorption the photocurrent yield actually drops at the Fe K edge but still exhibits x-ray absorption fine structure (EXAFS) behavior. Both conductivity and transmission measurements give identical Fe(C5H5)2 bond lengths.