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1 2008

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Electron beam irradiation induced changes in liquid-crystal compound 5CB

Rath M. C., Sarkar S. K., Wadhawan V. K., Verma R., Das I. M. L., Dąbrowski R., Tykarska M., Dhar R.

Opto-Electronics Review

2008

Vol. 16, No. 4

399-403

Electron beam irradiation studies on liquid crystal material 5CB have been carried out at a temperature where the compound exists in the isotropic liquid phase. In situ time-resolved spectroscopic characterization was carried out during the irradiation. Three different transients were observed during the 2-μs electron pulse. After about 50 μs, only one transient species was found to be present, which has an absorption peak at 360 nm. Radiolysed sample exhibits a broad absorption at ∼ 400 nm. The dielectric measurements show that even a low level of irradiation results in a dramatic increase in the component of dielectric permittivity normal to the long axes of the molecules ε ⊥', and a corresponding decrease in the dielectric anisotropy (Δ ε'=ε II — ε ⊥'). These studies show that 5CB is prone to substantial radiation damage on exposure to the beam of high-energy electrons.