Mercury dimer spectroscopy and an Einstein-Podolsky-Rosen experiment

摘要

The dissociation of a 199Hg2 dimer prepares an entangled state of two spatially separated199Hg atoms, each with nuclear spin 1/2, and with zero total electron and nuclear spinangular momenta. This is identical to the entangled state of the two spin 1/2 particles inBohm?s classic version of the EPR gedankenexperiment. An analysis of the rotationalstructure of the CD=57HCI=0 band of the D3K+u (1u)HX1Kg+ (0+g ) transition in Hg2 (naturalabundance) is presented. The analysis of the fluorescence excitation spectrum using a dyelaser gives the values of the constants BCD=57 and BCI=0 for the excited and ground electronicenergy states involved in the transition, respectively. To increase the accuracy of therotational constants and resolve the fine spectrum of the Hg2, a continuously tunable singlelongitudinal mode laser with ultra-narrow line-width is needed. Measurements using anarrow line-width alexandrite laser had been attempted and the values of BCD=57 and BCI=0were determined. To improve the quality of the laser beam and hence the precision of therotational constants, modifications have been made to the cavity of the alexandrite laser.This provides a possibility for further investigation.