1
|
Baykusheva D, Wörner HJ. Theory of attosecond delays in molecular photoionization. J Chem Phys 2017; 146:124306. [PMID: 28388142 DOI: 10.1063/1.4977933] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Denitsa Baykusheva
- Laboratorium für Physikalische Chemie, ETH Zürich,
Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Hans Jakob Wörner
- Laboratorium für Physikalische Chemie, ETH Zürich,
Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| |
Collapse
|
2
|
Photon Energy Dependence of the Vibrational Fine Structure in Core Level Photoemission Spectra Near Threshold. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199500036] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
3
|
Lin Y, Mayer PM. Fluorescence from the A 2Σ +state suggests a non-Franck–Condon N 2O +•vibrational state population after keV collisional activation with helium. CAN J CHEM 2011. [DOI: 10.1139/v10-123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A commercial analytical mass spectrometer coupled with a spectrograph and charge-coupled device (CCD) detector was used to obtain the collision-induced emission (CIE) spectra (190–1020 nm) from ion–molecule collisions between N2O+•and He at laboratory frame collision energies of 4–8 keV. The observed emissions were from the A2Σ+ → X2Π+system of N2O+•, excited fragments of the parent molecule, and the target gas. The relative emission intensities of the N2O+•ions and their fragments were independent of the ion translational energy within the 4–8 keV range, confirming the curve-crossing mechanism for translational-to-internal energy transfer in this system. Band emission intensities of [Formula: see text] and [Formula: see text] relative to the [Formula: see text] band within the N2O+•(A → X) system have been measured and compared with reference data. The results indicated that the collisionally excited ion has a decidedly non-Franck–Condon vibrational state distribution.
Collapse
Affiliation(s)
- Yawei Lin
- Department of Chemistry, University of Ottawa, 10 Marie-Curie, Ottawa, ON K1N 6N5, Canada
| | - Paul M. Mayer
- Department of Chemistry, University of Ottawa, 10 Marie-Curie, Ottawa, ON K1N 6N5, Canada
| |
Collapse
|
4
|
|
5
|
Contini G, Zema N, Turchini S, Catone D, Prosperi T, Carravetta V, Bolognesi P, Avaldi L, Feyer V. Vibrational state dependence of β and D asymmetry parameters: The case of the highest occupied molecular orbital photoelectron spectrum of methyl-oxirane. J Chem Phys 2007; 127:124310. [PMID: 17902906 DOI: 10.1063/1.2779324] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The beta angular asymmetry and D dichroic asymmetry parameters of the methyl-oxirane highest occupied molecular orbital (HOMO) band have been experimentally investigated with vibrational resolution using synchrotron radiation. A theoretical calculation of the Franck-Condon factors between vibrational ground state and different ionic vibrational states, in the Born-Oppenheimer harmonic approximation, has been performed in order to gain information on the vibrational states mainly involved in the HOMO photoelectron band. The general good agreement between theoretical and experimental results allows a reliable assignment of the major features. The experimental determination of beta and D shows their dependence on the different final vibrational states. This paper reports, for the first time, experimental evidence of the dependence of the dichroic D parameter on the vibrational excitation of the ion.
Collapse
Affiliation(s)
- G Contini
- CNR-ISM, Area della Ricerca di Tor Vergata, Via Del Fosso del Cavaliere 100, I-00133 Roma, Italy.
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Rathbone GJ, Poliakoff ED, Bozek JD, Toffoli D, Lucchese RR. Photoelectron trapping in N2O 7sigma-->ksigma resonant ionization. J Chem Phys 2005; 123:014307. [PMID: 16035835 DOI: 10.1063/1.1946738] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Vibrationally resolved photoelectron spectroscopy of the N2O+(A 2Sigma+) state is used to compare the dependence of the photoelectron dynamics on molecular geometry for two shape resonances in the same ionization channel. Spectra are acquired over the photon energy range of 18< or =hv< or =55 eV. There are three single-channel resonances in this range, two in the 7sigma-->ksigma channel and one in the 7sigma-->kpi channel. Vibrational branching ratio curves are determined by measuring vibrationally resolved photoelectron spectra as a function of photon energy, and theoretical branching ratio curves are generated via Schwinger variational scattering calculations. In the region 30< or =hv< or =40 eV, there are two shape resonances (ksigma and kpi). The ksigma ionization resonance is clearly visible in vibrationally resolved measurements at hv=35 eV, even though the total cross section in this channel is dwarfed by the cross section in the degenerate, more slowly varying 7sigma-->kpi channel. This ksigma resonance is manifested in non-Franck-Condon behavior in the approximately antisymmetric v3 stretching mode, but it is not visible in the branching ratio curve for the approximately symmetric v1 stretch. The behavior of the 35-eV ksigma resonance is compared to a previously studied N2O 7sigma-->ksigma shape resonance at lower energy. The mode sensitivity of the 35-eV ksigma resonance is the opposite of what was observed for the lower-energy resonance. The contrasting mode-specific behavior observed for the high- and low-energy 7sigma-->ksigma resonances can be explained on the basis of the "approximate" symmetry of the quasibound photoelectron resonant wave function, and the contrasting behavior reflects differences in the continuum electron trapping. An examination of the geometry dependence of the photoelectron dipole matrix elements shows that the ksigma resonances have qualitatively different dependences on the individual bond lengths. The low-energy resonance is influenced only by changes in the end-to-end length of the molecule, whereas the higher-energy resonance depends on the individual N-N and N-O bond lengths. Branching ratios are determined for several vibrational levels, including the symmetry-forbidden bending mode, and all of the observed behavior is explained in the context of an independent particle, Born-Oppenheimer framework.
Collapse
Affiliation(s)
- G J Rathbone
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | | | | | | | | |
Collapse
|
7
|
Rathbone GJ, Poliakoff ED, Bozek JD, Lucchese RR. Electronically forbidden (5σu→kσu) photoionization of CS2: Mode-specific electronic-vibrational coupling. J Chem Phys 2005; 122:064308. [PMID: 15740373 DOI: 10.1063/1.1850474] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Vibrationally resolved photoelectron spectroscopy of the CS(2) (+)(B (2)Sigma(u) (+)) state is used to show how nontotally symmetric vibrations "activate" a forbidden electronic transition in the photoionization continuum, specifically, a 5sigma(u)-->ksigma(u) shape resonance, that would be inaccessible in the absence of a symmetry breaking vibration. This electronic channel is forbidden owing to inversion symmetry selection rules, but it can be accessed when a nonsymmetric vibration is excited, such as bending or antisymmetric stretching. Photoelectron spectra are acquired for photon energies 17</=hnu</=72 eV, and it is observed that the forbidden vibrational transitions are selectively enhanced in the region of a symmetry-forbidden continuum shape resonance centered at hnu approximately 42 eV. Schwinger variational calculations are performed to analyze the data, and the theoretical analysis demonstrates that the observed forbidden transitions are due to photoelectron-mediated vibronic coupling, rather than interchannel Herzberg-Teller mixing. We observe and explain the counterintuitive result that some vibrational branching ratios vary strongly with energy in the region of the resonance, even though the resonance position and width are not appreciably influenced by geometry changes that correspond to the affected vibrations. In addition, we find that another resonant channel, 5sigma(u)-->kpi(g), influences the symmetric stretch branching ratio. All of the observed effects can be understood within the framework of the Chase adiabatic approximation, i.e., the Born-Oppenheimer approximation applied to photoionization.
Collapse
Affiliation(s)
- G J Rathbone
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | | | | | | |
Collapse
|
8
|
Rathbone GJ, Poliakoff ED, Bozek JD, Lucchese RR. Intrachannel vibronic coupling in molecular photoionization. CAN J CHEM 2004. [DOI: 10.1139/v04-079] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We discuss the excitation of forbidden vibrational transitions accompanying photoionization of linear triatomic molecules. Excitation of a single quantum of the antisymmetric stretching vibration is observed for mole cules with inversion symmetry, as is the bending mode. Photoelectron spectra of the N2O+(A2Π), CO2+(C2Σg+), and CS2+(B2Σu+) states obtained over a range of ionization energies exhibit contrasting behavior for the relative intensities of the forbidden vibrations. These energy-dependent vibrational branching ratios are shown to result from an intrachannel vibronic coupling mechanism. Moreover, this intrachannel coupling can be further divided into two cases, one in which the photoionization cross section is sensitive to geometry changes, and a second case in which it is not. These different cases can be distinguished by comparing the experimental and theoretical results for all three molecules.Key words: photoelectron spectroscopy, vibronic coupling, photoionization.PACS Nos.: 33.60.Cv, 33.20.Ni, 33.20.Wr, 33.80.Eh
Collapse
|
9
|
Doomes EE, Floriano PN, Tittsworth RW, McCarley RL, Poliakoff ED. Anomalous XANES Spectra of Octadecanethiol Adsorbed on Ag(111). J Phys Chem B 2003. [DOI: 10.1021/jp021510d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E. E. Doomes
- Department of Chemistry and Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70803
| | - P. N. Floriano
- Department of Chemistry and Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70803
| | - R. W. Tittsworth
- Department of Chemistry and Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70803
| | - R. L. McCarley
- Department of Chemistry and Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70803
| | - E. D. Poliakoff
- Department of Chemistry and Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70803
| |
Collapse
|
10
|
Miller JS, Poliakoff ED, Miller TF, Natalense APP, Lucchese RR. Excitation of the symmetry forbidden bending mode in molecular photoionization. J Chem Phys 2001. [DOI: 10.1063/1.1349090] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
11
|
Föhlisch A, Hasselström J, Karis O, Väterlein P, Mårtensson N, Nilsson A, Heske C, Stichler M, Keller C, Wurth W, Menzel D. Franck–Condon breakdown in core-level photoelectron spectroscopy of chemisorbed CO. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)01194-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
12
|
|
13
|
Karawajczyk A, Erman P, Rachlew E, Stankiewicz M, Yoshiki Franzén K. Quasi-discrete resonances observed in photoionization to the A2Πu state of the CS2+ molecule. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)00078-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
14
|
Das R, Wu C, Poliakoff ED. Global energy dependence of N2O+(A 2Σ+) photoion alignment. J Chem Phys 1997. [DOI: 10.1063/1.475231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
15
|
Stratmann RE, Lucchese RR. Vibrationally resolved cross sections for the photoionization of CS2. J Chem Phys 1994. [DOI: 10.1063/1.467986] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
16
|
Ukai M, Kameta K, Machida S, Kouchi N, Hatano Y, Tanaka K. Extreme‐ultraviolet photodissociation of N2O in superexcited states. J Chem Phys 1994. [DOI: 10.1063/1.467336] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
17
|
Hallmeier KH, Pavlychev A, Szargan R, Beyer L, Hennig C, Thiel F. Splitting of the 1s−1 3p resonance in sulfur K XANES by surroundings in compounds with sulfurcarbon double bond. Chem Phys 1993. [DOI: 10.1016/0301-0104(93)85073-h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
18
|
Randall KJ, Kilcoyne AL, Köppe HM, Feldhaus J, Bradshaw AM, Rubensson J, Eberhardt W, Xu Z, Johnson PD, Ma Y. Photon energy dependence of the high resolution C 1s photoelectron spectrum of CO in the threshold region. PHYSICAL REVIEW LETTERS 1993; 71:1156-1159. [PMID: 10055464 DOI: 10.1103/physrevlett.71.1156] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
19
|
Tokue I, Kudo T, Ito Y. Emission cross section and vibrational branching ratios of the N2O+ (Ã 2Σ+ −X̃ 2Π) band produced by He* (2 3S) impact on N2O. Chem Phys Lett 1992. [DOI: 10.1016/0009-2614(92)87023-i] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
20
|
Kakar S, Choi H, Poliakoff ED. Localization of a continuum shape resonance. Photoionization of CS2. J Chem Phys 1992. [DOI: 10.1063/1.463870] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
21
|
Tokue I, Kobayashi M, Ito Y. Vibrational distributions of N2O+(Ã 2Σ+) produced by electron impact on jet‐cooled N2O. J Chem Phys 1992. [DOI: 10.1063/1.462396] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
22
|
Kakar S, Poliakoff ED, Rosenberg RA. Vibrationally resolved shape resonant photoionization of SiF4. J Chem Phys 1992. [DOI: 10.1063/1.462511] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
23
|
Shape resonances in photoionizations of cyanoacetylene. Experimental and theoretical investigations of the X̃ 2Π, Ã 2Σ and B̃ 2Π ionizations up to a photon energy of 28 eV. Chem Phys 1991. [DOI: 10.1016/0301-0104(91)87010-s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
24
|
Schmidbauer M, Kilcoyne ALD, Randall KJ, Feldhaus J, Bradshaw AM, Braunstein M, McKoy V. Angle‐resolved photoelectron spectroscopy of the core levels of N2O. J Chem Phys 1991. [DOI: 10.1063/1.460514] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
25
|
|
26
|
Bozek JD, Bancroft GM, Tan KH. Vibrational fine structure in the Si 2p photoelectron spectra of simple gaseous molecules. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:3597-3608. [PMID: 9905447 DOI: 10.1103/physreva.43.3597] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
27
|
Braunstein M, McKoy V. Vibrational branching ratios and shape resonant photoionization dynamics in N2O. J Chem Phys 1989. [DOI: 10.1063/1.456096] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
28
|
Kelly LA, Duffy LM, Space B, Poliakoff ED, Roy P, Southworth SH, White MG. Vibrationally resolved shape resonant photoionization of N2O. J Chem Phys 1989. [DOI: 10.1063/1.456097] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|