Simulations of photochemical reaction dynamics have been a challenge to the theoretical chemistry community for some time. In an effort to determine the predictive character of current approaches, we predict the results of an upcoming ultrafast diffraction experiment on the photodynamics of cyclobutanone after excitation to the lowest lying Rydberg state (S2). A picosecond of nonadiabatic dynamics is described with ab initio multiple spawning. We use both time dependent density functional theory (TDDFT) and equation-of-motion coupled cluster singles and doubles (EOM-CCSD) theory for the underlying electronic structure theory. We find that the lifetime of the S2 state is more than a picosecond (with both TDDFT and EOM-CCSD). The predicted ultrafast electron diffraction spectrum exhibits numerous structural features, but weak time dependence over the course of the simulations.
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28 June 2024
Research Article|
June 24 2024
Prediction of photodynamics of 200 nm excited cyclobutanone with linear response electronic structure and ab initio multiple spawning Available to Purchase
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Prediction Challenge: Cyclobutanone Photochemistry
Diptarka Hait
;
Diptarka Hait
(Conceptualization, Formal analysis, Investigation, Methodology, Project administration, Resources, Validation, Writing – original draft, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Dean Lahana
;
Dean Lahana
(Formal analysis, Investigation, Methodology, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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O. Jonathan Fajen
;
O. Jonathan Fajen
(Formal analysis, Investigation, Methodology, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Amiel S. P. Paz
;
Amiel S. P. Paz
(Investigation, Methodology, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Pablo A. Unzueta
;
Pablo A. Unzueta
(Investigation, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Bhaskar Rana
;
Bhaskar Rana
(Investigation, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Lixin Lu
;
Lixin Lu
(Investigation, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Yuanheng Wang
;
Yuanheng Wang
(Resources, Software, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Eirik F. Kjønstad
;
Eirik F. Kjønstad
(Software, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
3
Department of Chemistry, Norwegian University of Science and Technology
, Trondheim 7491, Norway
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Henrik Koch
;
Henrik Koch
(Software, Writing – review & editing)
3
Department of Chemistry, Norwegian University of Science and Technology
, Trondheim 7491, Norway
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Todd J. Martínez
Todd J. Martínez
a)
(Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
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Diptarka Hait
1,2
Dean Lahana
1,2
O. Jonathan Fajen
1,2
Amiel S. P. Paz
1,2
Pablo A. Unzueta
1,2
Bhaskar Rana
1,2
Lixin Lu
1,2
Yuanheng Wang
1,2
Eirik F. Kjønstad
1,2,3
Henrik Koch
3
Todd J. Martínez
1,2,a)
1
Department of Chemistry and The PULSE Institute, Stanford University
, Stanford, California 94305, USA
2
SLAC National Accelerator Laboratory
, Menlo Park, California 94024, USA
3
Department of Chemistry, Norwegian University of Science and Technology
, Trondheim 7491, Norway
J. Chem. Phys. 160, 244101 (2024)
Article history
Received:
February 16 2024
Accepted:
May 05 2024
Citation
Diptarka Hait, Dean Lahana, O. Jonathan Fajen, Amiel S. P. Paz, Pablo A. Unzueta, Bhaskar Rana, Lixin Lu, Yuanheng Wang, Eirik F. Kjønstad, Henrik Koch, Todd J. Martínez; Prediction of photodynamics of 200 nm excited cyclobutanone with linear response electronic structure and ab initio multiple spawning. J. Chem. Phys. 28 June 2024; 160 (24): 244101. https://doi.org/10.1063/5.0203800
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