Resonance Multiphoton Ionization Spectroscopy Of P-methoxybenzonitrile And Zero Kinetic Energy Spectroscopy Of P-isopropylphenol

The development of laser spectral technology provides the possibility of studying the internal vibration and rotation of molecules.The zero kinetic energy spectroscopy is a high resolution and high sensitivity spectroscopy technique to measure the characteristics of vibration and rotation of ions,which was developed in recent years.The resonant enhanced multiphoton ionization?REMPI?spectrum of p-methoxybenzonitrile and the mass analyzed threshold ionization?MATI?spectroscopy of p-isopropylphenol were obtained on our new experiment system of zero kinetic energy?ZEKE?spectroscopy.p-Methoxybenzonitrile is an important chemical and industrial material.We obtain the high-resolution one color resonance two-photon ionization spectra of p-methoxybenzonitrile in the range of 0-2400 cm^-1 for the first time on the MATI experiment system.It is determined that there is only one stable configuration for p-methoxybenzonitrile.The 0?0 transition energy of the ground state to the excited state is determined to be 35549 ± 2 cm^-1.We also perform the density functional theory calculation on p-methoxybenzonitrile.The experiment spectra are identified and described according to the calculated results.In addition to the fundamental vibrations,many combined vibrations between breathing and other fundamental vibrations are found in the range of 800-2400 cm^-1.These new results will be an important reference for future researche on Rydberg states,chemical kinetics and zero kinetic energy spectroscopy of p-methoxybenzonitrile.p-Isopropylphenol is an important intermediates of pesticides,pharmaceuticals and chemicals.We obtain the high-resolution one color resonance enhanced two-photon ionization spectra and the MATI spectra of p-isopropylphenol for the first time.The theoretical calculation on p-isopropylphenol are performed.The spectra are identified and described according to the calculated results.Our experimental and theoretical results show that there are two stable rotational isomers of p-isopropylphenol,i.e.trans and cis.The band origin of transitions from the ground state to the excited state are 35580 ± 2 cm^-1 and 35595 ± 2 cm^-1 for the trans and cis isomers,respectively.Their precise ionization energy are 65330 ± 5 cm^-1 and 65354 ± 5 cm^-1,respectively.These new and accurate data is valueful for the further research on isopropylphenol.