Zhou Lu, Hong Gao, Yun-tao Xu, Lei Yang, Chow-Shing Lam, Yanice Benitez, C. Y. Ng. High-Resolution Threshold Photoelectron Spectroscopy by Vacuum Ultraviolet Laser Velocity-Map-Imaging Method[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 59-69. doi: 10.1063/1674-0068/29/cjcp1512247
Citation: Zhou Lu, Hong Gao, Yun-tao Xu, Lei Yang, Chow-Shing Lam, Yanice Benitez, C. Y. Ng. High-Resolution Threshold Photoelectron Spectroscopy by Vacuum Ultraviolet Laser Velocity-Map-Imaging Method[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 59-69. doi: 10.1063/1674-0068/29/cjcp1512247

High-Resolution Threshold Photoelectron Spectroscopy by Vacuum Ultraviolet Laser Velocity-Map-Imaging Method

doi: 10.1063/1674-0068/29/cjcp1512247
  • Received Date: 2015-12-01
  • Rev Recd Date: 2015-12-15
  • We have obtained the high-resolution threshold photoelectron (TPE) spectra of chlorobenzene C6H5Cl (X1A1), propargyl radical C3H3 (X2B1), and allyl radical C3H5 (X2A1) by employing the vacuum ultraviolet (VUV) laser velocity-map-imaging-TPE (VUV-VMI-TPE) method. The photoelectron energy resolution of 1-2 cm-1 observed for the VUV-VMI-TPE method is comparable to that achieved in VUV laser pulsed-field ionization-photoelectron (VUV-PFI-PE) measurements. Similar to VUV-PFI-PE measurements, the energy resolutions for VUV-VMI-photoelectron (VUV-VMI-PE) and VUV-VMI-TPE measurements are found to depend on the dc electric field F in V/cm used at the photoionization region for electron extraction. The decrease of the ionization thresholds of C6H5Cl and C3H3 observed as a function of F shows that the Stark shift correction for VUV-VMI-TPE measurements is governed by the formula -3.1√F in cm-1, which is half of the classical prediction of -6.1√F in cm-1.} We have also measured the VUV-VMI-PE spectra of C6H5Cl and C3H5 at VUV energies near their ionization thresholds. The cationic vibrational bands observed in the VUV-VMI-PE measurements were assigned to be the vibrational progression, nv7+ (n=0-3), for C3H5+. The higher experimental sensitivity and similar energy resolutions achieved in VUV-VMI-TPE compared to VUV-PFI-PE measurements make the VUV-VMI-TPE method an excellent alternative for high-resolution VUV-PFI-PE measurements.
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High-Resolution Threshold Photoelectron Spectroscopy by Vacuum Ultraviolet Laser Velocity-Map-Imaging Method

doi: 10.1063/1674-0068/29/cjcp1512247

Abstract: We have obtained the high-resolution threshold photoelectron (TPE) spectra of chlorobenzene C6H5Cl (X1A1), propargyl radical C3H3 (X2B1), and allyl radical C3H5 (X2A1) by employing the vacuum ultraviolet (VUV) laser velocity-map-imaging-TPE (VUV-VMI-TPE) method. The photoelectron energy resolution of 1-2 cm-1 observed for the VUV-VMI-TPE method is comparable to that achieved in VUV laser pulsed-field ionization-photoelectron (VUV-PFI-PE) measurements. Similar to VUV-PFI-PE measurements, the energy resolutions for VUV-VMI-photoelectron (VUV-VMI-PE) and VUV-VMI-TPE measurements are found to depend on the dc electric field F in V/cm used at the photoionization region for electron extraction. The decrease of the ionization thresholds of C6H5Cl and C3H3 observed as a function of F shows that the Stark shift correction for VUV-VMI-TPE measurements is governed by the formula -3.1√F in cm-1, which is half of the classical prediction of -6.1√F in cm-1.} We have also measured the VUV-VMI-PE spectra of C6H5Cl and C3H5 at VUV energies near their ionization thresholds. The cationic vibrational bands observed in the VUV-VMI-PE measurements were assigned to be the vibrational progression, nv7+ (n=0-3), for C3H5+. The higher experimental sensitivity and similar energy resolutions achieved in VUV-VMI-TPE compared to VUV-PFI-PE measurements make the VUV-VMI-TPE method an excellent alternative for high-resolution VUV-PFI-PE measurements.

Zhou Lu, Hong Gao, Yun-tao Xu, Lei Yang, Chow-Shing Lam, Yanice Benitez, C. Y. Ng. High-Resolution Threshold Photoelectron Spectroscopy by Vacuum Ultraviolet Laser Velocity-Map-Imaging Method[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 59-69. doi: 10.1063/1674-0068/29/cjcp1512247
Citation: Zhou Lu, Hong Gao, Yun-tao Xu, Lei Yang, Chow-Shing Lam, Yanice Benitez, C. Y. Ng. High-Resolution Threshold Photoelectron Spectroscopy by Vacuum Ultraviolet Laser Velocity-Map-Imaging Method[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 59-69. doi: 10.1063/1674-0068/29/cjcp1512247
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