Symmetry- and vibrationally-resolved C K-shell photoionization studies of C2H2

Relationship between polarization-averaged molecular-frame photoelectron angular distributions and geometry

“…Figure 1 shows the calculated total photoionization cross sections. They are in good agreement with the experimental measurements [22][23][24][25][26][27][28]. Except for SF 6 , the cross-sectional values are rather similar for all systems in a wide range of photoelectron energies, > 70 eV.…”

Role of the recoil effect in two-center interference in X-ray photoionization

“…Modern X-ray photoelectron spectroscopy using high-resolution soft X-ray beam lines of synchrotron radiation facilities is now able to resolve the very small 1r g1r u splittings ($0.1 eV) in the core ionization of molecular C 2 H 2 [11,12] and N 2 [13,14]. Partial cross sections for the 1r g and 1r u core-level photoionization of C 2 H 2 [12,15] and N 2 [13,16] were also measured in the shape resonance regions. These investigations motivated us to extend the 1r g -1r u resolved measurement for the core-level photoemission from the C 2 H 2 and N 2 molecules to the high energy range up to $1 keV and observe the CF interference pattern.…”

Vibrationally resolved partial cross sections and asymmetry parameters for carbon K-shell photoionization of the CO2molecule

“…This is also the case for molecular photoionization where photoemission is accompanied by vibrational excitation of the residual molecular ion. Recent high-resolution soft x-ray photoelectron spectroscopic studies [1][2][3][4][5][6][7][8][9][10][11] show that the spectral and angular distributions for inner-shell photoemission from molecules in shape resonance regions depend on the final vibrational state, as predicted theoretically some decades ago [12,13].…”

“…There have also been studies of the K-shell photoionization of nitrogen molecules N 2 [10] and of C K-shell photoionization of acetylene C 2 H 2 [11]. Compared to CO, N 2 shows an additional complication.…”

“…These studies [6,7,10,11] illustrate the important role of nuclear dynamics in shape resonance phenomena and motivated us to extend these studies to a linear triatomic molecule CO 2 . The CO 2 molecule has four vibrational modes, the symmetric (v 1 , 0, 0) and antisymmetric (0, 0, v 3 ) stretching modes and a doubly degenerate bending mode (0, v 2 , 0), and one might thus expect vibrational excitation of these modes to accompany photoionization of CO 2 .…”