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Abstract:
By a combined optical and microwave pumping cycle, chlorine NQR transitions could be observed for a dilute mixed single crystal of p-dichlorobenzene (p-DCB) in p-dibromobenzene (p-DBB). From the line splittings in the NQR spectrum of the singlet ground state of p-DCB for an orientation of the external magnetic field Bo parallel to one of the in-plane fine structure axes, a considerable deviation (Δθ = 12°, Δφ = 20°) of this axis from a direction expected for an undistorted triplet-state molecule can be calculated. In addition, a lower limit of the electric field-gradient asymmetry parameter (η > 0.06) for singlet state p-DCB in the p-DBB matrix at 1.2 K is established.
