Pump-probe spectroscopy combined with laser and synchrotron radiation is performed to study the ionization and dissociation dynamics of N2 and N2O in the extreme ultraviolet energy region. The N2+(X 2Σ+g, v, N) ion produced from N2 or N2O by synchrotron radiation excitation is detected by laser-induced fluorescence (LIF) spectroscopy. To increase the number density of ions produced by synchrotron radiation photoexcitation, a cylindrical ion trap cell is employed. The effect of thermalization on the internal state distributions of N2+ ion can be ignored in the ion trap. The rotational structure of the electronic excitation B 2Σ+u, v′=0, N′ ← X 2Σ+g, v″=0, N″ of N2+ produced from N2 is clearly resolved by using a narrow-bandwidth Ti:sapphire laser. The yield curves for N2+(X 2Σ+g, v=0, 1) are also measured as a function of the photon energy of the synchrotron radiation. The rotational temperature of N2+(X 2Σ+g, v=0) produced from N2O+(B 2Π) is determined from a LIF spectrum to be in the range 200-230 K. The analysis based on the impulsive model indicates that the equilibrium bond angle of the vibrational ground state of N2O+(B 2Π) is >160°.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry