supported by National Natural Science Foundation of China(Grant Nos.50971094,10474067);Natural Science Foundation of Beijing(Grant No.1092007);National Keystone Basic Research Program(Grant No.2007CB310408)
Terahertz transmission spectra of methylparaben, ethylparaben, propyl-p-hydroxybenzoate and butyl-p-hydroxybenzoate were measured by terahertz time-domain spectroscopy (THz-TDS) at 7.8 K. While it was difficult to o...