Synchrotron radiation excited photoelectron spectrum of with rotational resolution

Abstract

The rotational branching ratio in the photoelectron spectrum of has been investigated using synchrotron radiation. At the photon energy , the S branch has a considerably higher relative intensity than when excited with He I (, or with Ne I (, ) radiation.

Dipole and nondipole photoionization of molecular hydrogen

“…Photoelectron spectra of H 2 have been recorded that resolve vibrational and rotational structure of the H 2 + ion [8,9]. The goal of the present experiments was to accurately measure vibrationally averaged angular distributions for comparison with fixed-nuclei calculations.…”

“…Several aspects of molecular photoionization have been studied in H 2 , beginning with the total and dissociative photoionization cross sections [2][3][4]. Other aspects include ion-pair formation [5], double photoionization [6], vibrational autoionization [7], rotational and vibrational structure in the photoelectron spectrum [8,9], resonant photoionization involving doubly excited states [10][11][12], and the photoelectron [13] and photoion [6,14] angular distributions. Other research includes a study of competition between photodissociation and photoionization [15], nonperturbative time-dependent calculations of ionization by femtosecond xuv laser pulses [16], strong-field infrared laser ionization [17], and symmetry breaking in dissociative photoionization [18].…”

He I Ultraviolet Photoelectron Spectroscopy of Benzene and Pyridine in Supersonic Molecular Beams Using Photoelectron Imaging

“…5): for instance, the electrodes shown in Figure 1b are 12 in total whereas the lens electrodes behind the extractor are 7 (nos. [6][7][8][9][10][11][12]. As shown in Figure 3, the calculated velocity resolution improves as more lens electrodes are employed; however, it was practically saturated at 7 electrodes.…”

“…Even at the highest spectral resolution achieved using a hemispherical energy analyzer, , UPS fails to match the resolution accomplished by pulsed-field-ionization zero-kinetic-energy photoelectron spectroscopy (PFI-ZEKE). , PFI-ZEKE observes the resonances of the photon energy with the rovibronic energies of Rydberg states associated with each cation state. , It utilizes the fact that Rydberg states with high principal quantum numbers are structurally similar to a cationic state due to the weak coupling between the Rydberg electron and the ion core. PFI-ZEKE requires these Rydberg states to be long-lived; it thus encounters difficulties when the Rydberg states rapidly dissociate or undergo autoionization .…”

Electronic structure of layered transition-metal dichalcogenides Nb1 xTixXc2 (Xc = S, Se, Te) studied by angle-resolved photoemission spectroscopy

“…ARPES measurements were performed using a Gammadata-Scienta SES-200 spectrometer with a high-flux discharge lamp and a toroidal grating monochromator. The He Iα (hν = 21.218 eV [13]) resonance line was used to excite photoelectrons. The energy and angular (momentum) resolutions were set at 15 meV and 0.2 • (0.007 Å −1 ), respectively.…”