1
|
Carravetta V, Couto RC, Ågren H. X-ray absorption of molecular cations-a new challenge for electronic structure theory. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:363002. [PMID: 35767974 DOI: 10.1088/1361-648x/ac7d2a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
In this paper we put forward some historical notes on the development of computational chemistry toward applications of x-ray spectroscopies. We highlight some of the important contributions by Enrico Clementi as method and program developer and as a supporter of this branch of computational research. We bring up a modern example based on the very recent experimental development of x-ray absorption of cationic molecules. As we show this spectroscopy poses new challenges for electronic structure theory and the electron correlation problem.
Collapse
Affiliation(s)
- V Carravetta
- Institute of Physical Chemical Processes-CNR, via Moruzzi 1, 56124 Pisa, Italy
| | - R C Couto
- Department of Theoretical Chemistry and Biology, School of Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - H Ågren
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| |
Collapse
|
2
|
Koulentianos D, Carniato S, Püttner R, Martins JB, Travnikova O, Marchenko T, Journel L, Guillemin R, Ismail I, Céolin D, Piancastelli MN, Feifel R, Simon M. The O K -2V spectrum of CO: the influence of the second core-hole. Phys Chem Chem Phys 2021; 23:10780-10790. [PMID: 33908498 DOI: 10.1039/d1cp00607j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using synchrotron radiation in the tender X-ray regime, a photoelectron spectrum showing the formation of single site double-core-hole pre-edge states, involving the K shell of the O atom in CO, has been recorded by means of high-resolution electron spectroscopy. The experimentally observed structures have been simulated, interpreted and assigned, employing state-of-the-art ab initio quantum chemical calculations, on the basis of a theoretical model, accounting for their so-called direct or conjugate character. Features appearing above the double ionization threshold have been reproduced by taking into account the strong mixing between multi-excited and continuum states. The shift of the σ* resonance below the double ionization threshold, in combination with the non-negligible contributions of multi-excited configurations in the final states reached, gives rise to a series of avoided crossings between the different potential energy curves.
Collapse
Affiliation(s)
- D Koulentianos
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris Cedex 05, France
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Lindblad R, Kjellsson L, Couto RC, Timm M, Bülow C, Zamudio-Bayer V, Lundberg M, von Issendorff B, Lau JT, Sorensen SL, Carravetta V, Ågren H, Rubensson JE. X-Ray Absorption Spectrum of the N_{2}^{+} Molecular Ion. PHYSICAL REVIEW LETTERS 2020; 124:203001. [PMID: 32501042 DOI: 10.1103/physrevlett.124.203001] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 01/15/2020] [Accepted: 04/08/2020] [Indexed: 06/11/2023]
Abstract
The x-ray absorption spectrum of N_{2}^{+} in the K-edge region has been measured by irradiation of ions stored in a cryogenic radio frequency ion trap with synchrotron radiation. We interpret the experimental results with the help of restricted active space multiconfiguration theory. Spectroscopic constants of the 1σ_{u}^{-1} ^{2}Σ_{u}^{+} state, and the two 1σ_{u}^{-1}3σ_{g}^{-1}1π_{g} ^{2}Π_{u} states are determined from the measurements. The charge of the ground state together with spin coupling involving several open shells give rise to double excitations and configuration mixing, and a complete breakdown of the orbital picture for higher lying core-excited states.
Collapse
Affiliation(s)
- R Lindblad
- Department of Physics, Lund University, Box 118, SE-22100 Lund, Sweden
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Inorganic Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden
| | - L Kjellsson
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
| | - R C Couto
- Theoretical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden
- Theoretical Chemistry and Biology, School of Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - M Timm
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
| | - C Bülow
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - V Zamudio-Bayer
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - M Lundberg
- Theoretical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden
| | - B von Issendorff
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - J T Lau
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - S L Sorensen
- Department of Physics, Lund University, Box 118, SE-22100 Lund, Sweden
| | | | - H Ågren
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
- Theoretical Chemistry and Biology, School of Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, People's Republic of China
| | - J-E Rubensson
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| |
Collapse
|
4
|
Gejo T, Oura M, Tokushima T, Horikawa Y, Arai H, Shin S, Kimberg V, Kosugi N. Resonant inelastic x-ray scattering and photoemission measurement of O2: Direct evidence for dependence of Rydberg-valence mixing on vibrational states in O 1s → Rydberg states. J Chem Phys 2017; 147:044310. [DOI: 10.1063/1.4994895] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- T. Gejo
- University of Hyogo, Koto 3-2-1, Kamigori-cho 678-1297, Japan
- Riken SPring-8 Center, Koto 1-1-1, Sayo-cho 679-5148, Japan
| | - M. Oura
- Riken SPring-8 Center, Koto 1-1-1, Sayo-cho 679-5148, Japan
| | - T. Tokushima
- Riken SPring-8 Center, Koto 1-1-1, Sayo-cho 679-5148, Japan
| | - Y. Horikawa
- Riken SPring-8 Center, Koto 1-1-1, Sayo-cho 679-5148, Japan
| | - H. Arai
- Riken SPring-8 Center, Koto 1-1-1, Sayo-cho 679-5148, Japan
| | - S. Shin
- Riken SPring-8 Center, Koto 1-1-1, Sayo-cho 679-5148, Japan
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - V. Kimberg
- Royal Institute of Technology, 106 91 Stockholm, Sweden
| | - N. Kosugi
- Institute for Molecular Science, Okazaki 444-8585, Japan
| |
Collapse
|