The 1A2 (n, 3px) Rydberg state of formaldehyde

The formaldehyde cation: Rovibrational energy level structure and Coriolis interaction near the adiabatic ionization threshold

“…(5) and (6)). Moreover, the orbital ionization model predicts the same selection rules of DN = 0, ± 1, ± 2, ± 3 and DK a = ±1 and intensity distribution for all three bands because ionization occurs out of the same molecular orbital in all three cases.…”

“…Since this pioneering study of the e A 1 A 2 e X 1 A 1 band system, extensive and comprehensive studies of the rotational structure and vibronic dynamics of the electronic ground [2][3][4] and electronic excited states [5][6][7][8][9] of neutral CH 2 O have been performed. In particular, the rovibrational structure of the polyads in the 3.5 lm [10] and 5-10 lm (see Refs.…”

“…The 3p x state is known to be the only member of the 3p complex with a well-behaved energy level structure [5,8]. The analysis of the intensity distribution in the rotationally resolved photoelectron spectra also provided insights into the photoionization dynamics of formaldehyde.…”

A 1 + 1′ resonance-enhanced multiphoton ionization scheme for rotationally state-selective detection of formaldehyde via the à 1A2 ← X̃ 1A1 transition

“…1, where they are compared with the scheme used in the current work. Most of these studies have made use of resonances with the (n,3p) Rydberg states, which lie 7.9-8.4 eV above the ground state and were first observed in VUV absorption [15][16][17] and inelastic electron scattering experiments. 18 (In this state label, ''n'' denotes the non-bonding 2b 2 orbital from which an electron is removed and ''3p'' denotes the Rydberg-like orbital into which the electron is excited.…”

Multiphoton ionization and photoelectron spectroscopy of formaldehyde via its 3p Rydberg states

“…In addition to finding excellent state selection routes, the results shed some new light on the 3p Rydberg states of this well-studied molecule. The literature concerning the spectroscopy of H 2 CO is sizable, including studies of emission, 14 absorption, [14][15][16][17][18][19][20][21][22][23][24][25] electric dichroism spectroscopy, 26 electron-impact spectroscopy, 27,28 multiphoton ionization, [29][30][31] photoelectron spectroscopy, [32][33][34][35] ZEKE-PFI, 36 and photoionization spectroscopy. 19,37,38 These studies have revealed much concerning the geometries, transition energies, and rovibronic energy levels for the ground and excited states for both neutral and ionic formaldehyde.…”