Magnetic field measurement, quantum integration

This intensity can either be monitored in a time-resolved fashion after pulsed excitation in the constant magnetic field B quantum beats, Sect. 7.2), or the time-integrated fluorescence intensity is measured as a function of B (level crossing), where the excitation may be pulsed or cw. 

The existence of fairly large delocalized electron flow was demonstrated in H2O, BH3, NH3, CH4, CH3-CH3, HsO-, CH3+, and NH/, by plots of quantum mechanical current density and by current susceptibilities, Eq. (7.55), calculated by accurate ab initio methods [102, 145]. The latter, also referred to as current strengths measured in nano ampere per tesla, are defined via flux integrals evaluated over suitably chosen molecular domains [76]. Simple procedures, allowing for ideal current models based on the BS law [46], have been applied to predict the ability of a certain molecule to support magnetic-field induced electron currents flowing through an interatomic circuit [77, 141-143]. 

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