Mössbauer Investigation of Frozen Solutions of 129I2

Abstract

The Mössbauer effect in the 27.8‐keV level of ¹²⁹I was used to investigate frozen solutions of I₂ in hexane, CCI₄, and benzene at 88°K and in solid argon at 22°K. The quadrupole couplings and isomer shifts of I₂ in hexane, CCl₄, and solid argon (inert solvents) were found to be very similar, the average values being $e^2\text{qQ\hspace{0.17em}=\hspace{0.17em}−\hspace{0.17em}2255\hspace{0.17em}±\hspace{0.17em}30}\mathrm{Mc}/\sec$ $\mathrm{(Q}\mathrm{of}{}^{127}\mathrm{I)}\mathrm{and}\mathrm{\delta (}\mathrm{ZnTe\; source}\text{)\hspace{0.17em}=\hspace{0.17em}+\hspace{0.17em}0.094\hspace{0.17em}±\hspace{0.17em}0.005}\mathrm{cm}/\sec$ . These values are interpreted as belonging to the free iodine molecule. For I₂ in benzene a coupling of $e^2\text{qQ\hspace{0.17em}=\hspace{0.17em}−\hspace{0.17em}2412}\mathrm{Mc}/\sec$ and isomer shift $\text{δ\hspace{0.17em}=\hspace{0.17em}+\hspace{0.17em}0.076}\mathrm{cm}/\sec$ were obtained. These values are in agreement with the electron transfer from the benzene ring to the iodine molecule.