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Wang K, Wang Y, Qiao H, Liu J, Zhang H, Li G. Outer Valence Photoionization and Autoionization of Formaldehyde. J Phys Chem A 2022; 126:5559-5564. [PMID: 35952653 DOI: 10.1021/acs.jpca.2c04207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigate photoionization from the ground electronic state of the formaldehyde molecule. Both partial cross sections and asymmetry parameters leading to the X2B2, A2B1, C2B2, and D2A1 states of H2CO+ ions are studied in the photon region of 10-90 eV using a multichannel R-matrix method, which uses the configuration interaction (CI) to describe electronic correlation. We check the sensitivity of the results to change descriptions of the continuum, the different partial waves, and the active spaces in the theoretical model. And we obtain the convergent result of the present calculations. Extensive resonance structures near the ionization threshold are observed for the first time. Our predicted total cross sections and asymmetry parameters differ from these obtained by previous theoretical approaches, all of which neglected correlation effects. The present results were found to agree reasonably well with the available experimental results, suggesting the reliability of our calculations.
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Affiliation(s)
- Kedong Wang
- School of Physics, Henan Normal University, Xinxiang 453007, Peoples Republic of China
| | - Yan Wang
- School of Physics, Henan Normal University, Xinxiang 453007, Peoples Republic of China
| | - Haiyang Qiao
- School of Physics, Henan Normal University, Xinxiang 453007, Peoples Republic of China
| | - Jie Liu
- School of Physics, Henan Normal University, Xinxiang 453007, Peoples Republic of China
| | - Haoxing Zhang
- School of Physics, Henan Normal University, Xinxiang 453007, Peoples Republic of China
| | - Guojun Li
- School of Physics, Henan Normal University, Xinxiang 453007, Peoples Republic of China
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Tanaka HK, Prudente FV, Medina A, Marinho RRT, Homem MGP, Machado LE, Fujimoto MM. Photoabsorption and photoionization cross sections for formaldehyde in the vacuum-ultraviolet energy range. J Chem Phys 2017. [DOI: 10.1063/1.4977605] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- H. K. Tanaka
- Instituto de Física, Universidade Federal da Bahia, 40.170-115 Salvador, BA, Brazil
- Instituto Federal da Bahia, 45.810-000, Porto Seguro, BA, Brazil
| | - F. V. Prudente
- Instituto de Física, Universidade Federal da Bahia, 40.170-115 Salvador, BA, Brazil
| | - A. Medina
- Instituto de Física, Universidade Federal da Bahia, 40.170-115 Salvador, BA, Brazil
| | - R. R. T. Marinho
- Instituto de Física, Universidade Federal da Bahia, 40.170-115 Salvador, BA, Brazil
| | - M. G. P. Homem
- Departamento de Química, Universidade Federal de São Carlos, 13.565-905 São Carlos, SP, Brazil
| | - L. E. Machado
- Departamento de Física, Universidade Federal de São Carlos, 13.565-905 São Carlos, SP, Brazil
| | - M. M. Fujimoto
- Departamento de Física, Universidade Federal do Paraná, 81.531-990 Curitiba, PR, Brazil
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Vega MV, Lavín C, Velasco AM. Angular distribution of photoelectrons in small molecules: a molecular quantum defect calculation. J Chem Phys 2012; 136:214308. [PMID: 22697544 DOI: 10.1063/1.4725536] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The molecular quantum defect orbital (MQDO) method, previously used in the determination of molecular photoionization cross sections, is applied here to calculate the angular distribution of photoelectrons arising from the molecular photoionization. Calculations are performed for the ionization from outer valence orbitals of HF, H(2)O, NH(3), N(2)O, and H(2)CO molecules. The results are compared with previous measurements and with theoretical curves found in the literature. Profiles of the angular distribution parameter as a function of photoelectron energy covering a range from the photoionization threshold to 120 eV are presented for the above molecules. The energy dependence of the angular distributions predicted by the MQDO calculations agrees fairly well with predictions from more sophisticated theories and with observed results.
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Affiliation(s)
- M V Vega
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, E-47005 Valladolid, Spain
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Lavín C, Velasco AM, Vega MV, Marín I, Pitarch-Ruiz J, Sánchez Marín J. Theoretical study of spectral intensities of formaldehyde in the discrete and continuum regions. J Phys Chem A 2009; 113:7155-60. [PMID: 19489599 DOI: 10.1021/jp900464q] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Theoretical absorption oscillator strengths for transitions involving Rydberg states in molecular formaldehyde as well as cross sections for photoionization Rydberg channels associated with the production of the lowest parent ion electronic state are reported. The calculations have been performed with the molecular quantum defect orbital (MQDO) method. A test on the MQDO f values has been its comparison with previous experiments and calculations and its compliance with the expected systematic trends along the Rydberg series. The use of the MQDO method as an alternative to ab initio methods, which find serious difficulties in calculating spectral intensities in formaldehyde, is proposed. We hope that the spectroscopic data, many of them reported here for the first time, may be useful for the interpretation of the vacuum ultraviolet spectrum of this molecule.
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Affiliation(s)
- C Lavín
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, E-47005 Valladolid, Spain
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Jones PM, May JA, Reitz JB, Solomon EI. Photoelectron Spectroscopic and Electronic Structure Studies of CH2O Bonding and Reactivity on ZnO Surfaces: Steps in the Methanol Synthesis Reaction. Inorg Chem 2004; 43:3349-70. [PMID: 15154797 DOI: 10.1021/ic035252q] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Adsorption of CH(2)O on ZnO(0001) has been investigated using XPS, NEXAFS, variable-energy photoelectron spectroscopy (PES), and density functional theory (DFT) calculations. CH(2)O is chemisorbed on the (0001) surface at 130 K. Its C1s XPS peak position at 292.7 eV and NEXAFS sigma shape resonance at 302.6 eV are consistent with an eta(1) bound surface geometry. Geometry optimized DFT calculations also indicate that CH(2)O is bound to the Zn(II) site in an eta(1) configuration through its oxygen atom. The variable-energy PES of the eta(1) bound CH(2)O/ZnO(0001) complex exhibits four valence band features at 21.2, 16.4, 13.8, and 10.7 eV below the vacuum level providing an experimental and theoretical description of this surface interaction. Annealing the ZnO(0001)/CH(2)O surface complex to 220 K decomposes the chemisorbed CH(2)O, producing formyl (291.5 eV), methoxide (290.2 eV), and formate (293.6 eV) intermediates. Thus this reaction coordinate involves the conversion of an oxygen bound formaldehyde to a carbon bound formyl species on ZnO(0001). Only formate is formed on the ZnO(100) surface. DFT is used to explore surface intermediates and the transition state in the methanol synthesis reaction (MSR). The bonding interactions of H(2), CO, CH(3)O(-), HCO(-), and trans-HCOH to the ZnO(0001) surface are elucidated using geometry optimization. H(2) was found to be heterolytically cleaved on the ZnO(0001) surface, and carbon monoxide, formyl, and methoxide are calculated to be eta(1) bound. These results are consistent with observed metal oxide surface reactivity where heterolytic bond cleavage is dominant. The oxygen atom in the bound formyl was found to be activated for attack by a proton. This results in the planar eta(1) bound trans-HCOH surface species. The transition state in the gas phase rearrangement of trans-HCOH to formaldehyde was calculated to have a barrier of 31 kcal/mol. The correlation diagram for this rearrangement in the gas phase indicates that configuration interaction at the crossing of two levels helps to lower the barrier. A transition state calculation was also performed for this rearrangement on the ZnO(0001) surface. The surface transition state geometry is significantly different than the gas phase. The surface geometry is no longer planar (23 degrees dihedral angle) and is displaced parallel to the surface. Interaction with the Zn(II) site at the crossing of surface bound CH(2)O and trans-HCOH levels further lowers the barrier to rearrangement relative to gas phase by 9 kcal/mol. The rearrangement of trans-HCOH (carbon bound) to CH(2)O (oxygen bound) on ZnO(0001) was calculated to be the overall barrier of the MSR reaction.
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Affiliation(s)
- P M Jones
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
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Spectral intensities of Rydberg transitions in carbonyl compounds. Formaldehyde, carbonyl fluoride and phosgene. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01591-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Liu J, Kim HT, Anderson SL. Multiphoton ionization and photoelectron spectroscopy of formaldehyde via its 3p Rydberg states. J Chem Phys 2001. [DOI: 10.1063/1.1370943] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Cooper G, Anderson JE, Brion C. Absolute photoabsorption and photoionization of formaldehyde in the VUV and soft X-ray regions (3–200 eV). Chem Phys 1996. [DOI: 10.1016/0301-0104(96)00079-1] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kilcoyne ALD, Schmidbauer M, Koch A, Randall KJ, Feldhaus J. C 1s photoionization of H2CO and C2H4: An angle‐resolved photoelectron study. J Chem Phys 1993. [DOI: 10.1063/1.464765] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sheehy JA, Gil TJ, Winstead CL, Farren RE, Langhoff PW. Correlation of molecular valence‐ andK‐shell photoionization resonances with bond lengths. J Chem Phys 1989. [DOI: 10.1063/1.457085] [Citation(s) in RCA: 111] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Holland D. A Photoelectron spectroscopy study of the four outermost valence orbitals of formaldehyde. Chem Phys 1989. [DOI: 10.1016/0301-0104(89)80226-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Photoionisation cross section calculations for H2O and NH3 by one-center expansion and Sticltjies technique. Chem Phys 1984. [DOI: 10.1016/0301-0104(84)85328-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Keller P, Taylor J, Grimm F, Carlson TA. Angle-resolved photoelectron spectroscopy of formaldehyde and methanol. Chem Phys 1984. [DOI: 10.1016/0301-0104(84)85090-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Padial N, Csanak G, McKoy BV, Langhoff PW. Photoexcitation and ionization in ozone: Stieltjes–Tchebycheff studies in the separated‐channel static‐exchange approximation. J Chem Phys 1981. [DOI: 10.1063/1.441647] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gerwer A, Asaro C, McKoy BV, Langhoff PW. Photoexcitation and ionization in molecular oxygen: Theoretical studies of electronic transitions in the discrete and continuous spectral intervals. J Chem Phys 1980. [DOI: 10.1063/1.438908] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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