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Pandey RK, Srikanth K, Tak A, Kumar A, Rao TR. A theoretical study of vibronic coupling in the photoelectron spectra of Al 6N . Phys Chem Chem Phys 2023; 25:12990-13003. [PMID: 37165932 DOI: 10.1039/d3cp00836c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
This work emphasizes the appearance of non-adiabatic effects in the photoelectron spectra of Al6N-. It includes ab initio electronic structure calculations obtained on the first seven low-lying electronic states of Al6N- and a nuclear dynamics study utilizing time-dependent and time-independent quantum chemistry approaches. A model vibronic Hamiltonian is constructed in a diabatic electronic representation to estimate the coupling parameters corresponding to the fifteen vibrational modes of Al6N-. Theoretical spectral bands are achieved by employing the vibronic coupling theory followed by reduced dimensional calculations to understand the role of individual vibrational modes in the overall photoelectron spectra. Finally, the theoretically obtained photodetachment spectra show good agreement with the experimental spectra revealing vibronic coupling among the closely spaced spectral bands.
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Affiliation(s)
- Rishabh Kumar Pandey
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India.
| | - Korutla Srikanth
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India.
| | - Anuj Tak
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India.
| | - Abhishek Kumar
- Indian Association for Cultivation of Science, Kolkata, West Bengal, 700032, India
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Srikanth K, Kumar A, Tammineni RR. Unraveling the Photoelectron Spectrum of 1-Phospha-2,3,4-triazolate Anion, HCPN 3-, A Theoretical Approach. J Phys Chem A 2023; 127:78-91. [PMID: 36563286 DOI: 10.1021/acs.jpca.2c06701] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The first five low-lying electronic states of HCPN3 are probed through extensive ab initio electronic structure and quantum dynamics studies to reproduce the 193 nm photoelectron spectrum. Vibronic Hamiltonian is constructed and availed for time-dependent (TD) and time-independent (TI) quantum dynamical studies. The presence of numerous conical intersections (CIs) and crossings among electronic states yielded interesting nonadiabatic effects in the photoelectron bands of the overall spectrum. Moreover, the theoretical bands corresponding to five electronic states have reproduced all three experimental spectral bands. Among these, the first two bands originated due to a combination of four electronic states as predicted by previous studies. The third band corresponds to the fifth electronic state. The results calculated via TD and TI approaches exhibited satisfying agreement with the experimental results.
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Affiliation(s)
- Korutla Srikanth
- Department of Chemistry, Indian Institute of Technology Patna, Patna801106, India
| | - Abhishek Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Patna801106, India
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Kumar A, Srikanth K, Sarkar K, Sarkar R, Rao TR. Understanding of the Photodetachment Spectrum of Anionic Mixed Carbon-Boron Cluster C 3B 5- Following Adiabatic and Nonadiabatic Quantum Chemistry Approaches. J Phys Chem A 2022; 126:4563-4576. [PMID: 35796655 DOI: 10.1021/acs.jpca.2c01683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The presence of nonadiabaticity in the photodetachment bands of the anionic mixed carbon-boron cluster C3B5- has been realized through ab initio electronic structure calculations and detailed analyses of quantum dynamics study on top of those electronic structures. In the course of our study, we traverse extensive first principles electronic structure calculations to compute potential energy curves and to trace the energetic locations for the conical intersections in the multidimensional surfaces. All the ab initio calculations are performed on the four low-lying electronic states of the C3B5 cluster, while quantum nuclear dynamics are pursued on those electronic states by applying both time-dependent and time-independent quantum chemistry frameworks. In particular, we rely on the diabatic electronic representation to construct the molecular Hamiltonian. Altogether, the simulated theoretical spectra offer exceptional agreement with the experimental attainments.
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Affiliation(s)
- Abhishek Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801106, India
| | - Korutla Srikanth
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801106, India
| | - Kanchan Sarkar
- Institut für Theoretische Chemie, Universität Ulm, 89081 Ulm, Germany
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Kumar A, Rao TR, Sarkar R. An unbiased confirmation of the participating isomers of C 2B 5- in the formation of its photo-detachment spectra: a theoretical study. Phys Chem Chem Phys 2021; 23:3160-3175. [PMID: 33498079 DOI: 10.1039/d0cp04619a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The primary goal of the present article is to provide an unbiased structural confirmation of C2B5-, relying on its available experimental photo-detachment spectra. The study is performed from scratch by optimizing the lowest energy isomers of C2B5- and later, suitable molecular vibronic Hamiltonians are constructed by analyzing the normal modes of these optimized isomers. The Hamiltonians' parameters are evaluated from the fits of the calculated ab initio single point energies using a state of the art multireference configuration (MRCI) level of theory employing a correlation consistent polarized triple zeta (cc-pVTZ) basis set. The state-averaged variant of the MRCI level of theory is also applied to deal with the highly interactive electronic states of both of the isomers. A detailed analysis of the potential energy curves along the totally symmetric vibrational modes is performed to understand the energy modulation between the different electronic states and also to find the energetic locations of the conical intersections. The introduction of the non-symmetric vibrational modes in the Hamiltonians help to understand the impact of non-adiabaticity during energy modulation in the coupled surfaces. Later, both adiabatic and non-adiabatic nuclear dynamics are performed on the electronic states of both of the isomers using the constructed reduced and full-dimensional Hamiltonians. The results of the adiabatic dynamics are used to assign the positions of the simulated photo-detachment bands, while the non-adiabatic dynamics improve the shape of those bands. Finally, we compare our theoretical findings with the available experimental photo-detachment spectra of C2B5- to provide an unbiased structural confirmation of the participating isomers of C2B5- in its photo-detachment spectra.
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Affiliation(s)
- Abhishek Kumar
- Department of Chemistry, Indian Institute of Technology, Patna, Bihta, Bihar, 801103, India.
| | - T Rajagopala Rao
- Department of Chemistry, Indian Institute of Technology, Patna, Bihta, Bihar, 801103, India.
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Yonehara T, Takatsuka K. Nonadiabtic electron dynamics in densely quasidegenerate states in highly excited boron cluster. J Chem Phys 2016; 144:164304. [DOI: 10.1063/1.4947302] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Takehiro Yonehara
- Department of Basic Science, The University of Tokyo, Komaba, 153-8902 Tokyo, Japan
| | - Kazuo Takatsuka
- Department of Basic Science, The University of Tokyo, Komaba, 153-8902 Tokyo, Japan
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Li ZW, Yonehara T, Takatsuka K. Nonadiabatic electron wavepacket study on symmetry breaking dynamics of the low-lying excited states of cyclic-B4. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2015.10.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Tai TB, Nguyen MT. Electronic structure and photoelectron spectra of Bnwith n = 26–29: an overview of structural characteristics and growth mechanism of boron clusters. Phys Chem Chem Phys 2015; 17:13672-9. [DOI: 10.1039/c5cp01851j] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In this report, the electronic structure and photoelectron spectra of boron clusters B26–29were theoretically investigated and an overview of the growth mechanism of boron clusters was shown.
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Affiliation(s)
- Truong Ba Tai
- Department of Chemistry
- University of Leuven
- Celestijnenlaan 200F
- B-3001 Leuven
- Belgium
| | - Minh Tho Nguyen
- Department of Chemistry
- University of Leuven
- Celestijnenlaan 200F
- B-3001 Leuven
- Belgium
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Tai TB, Nguyen MT. The B32cluster has the most stable bowl structure with a remarkable heptagonal hole. Chem Commun (Camb) 2015; 51:7677-80. [DOI: 10.1039/c5cc01252j] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cluster B320/−exhibits an aromatic bowl structure containing one heptagonal hole.
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Affiliation(s)
- Truong Ba Tai
- Department of Chemistry
- University of Leuven
- B-3001 Leuven
- Belgium
| | - Minh Tho Nguyen
- Department of Chemistry
- University of Leuven
- B-3001 Leuven
- Belgium
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Reddy SR, Mahapatra S. Theoretical study of photodetachment processes of anionic boron cluster. III. B7−. J Chem Phys 2014; 140:084311. [DOI: 10.1063/1.4865395] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tai TB, Duong LV, Pham HT, Mai DTT, Nguyen MT. A disk-aromatic bowl cluster B30: toward formation of boron buckyballs. Chem Commun (Camb) 2014; 50:1558-60. [DOI: 10.1039/c3cc48392d] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The B30 cluster is a bowl-shape structure, rather than a double-ring tubular form and exhibits disk-aromatic features similar to those of B19− and B202−. It suggests a consistent route for the formation of boron buckyballs such as B80 and B92 from multiple B30 units.
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Affiliation(s)
- Truong Ba Tai
- Department of Chemistry
- University of Leuven
- B-3001 Leuven, Belgium
| | - Long Van Duong
- Institute for Computational Science and Technology (ICST)
- Ho Chi Minh City, Vietnam
| | - Hung Tan Pham
- Institute for Computational Science and Technology (ICST)
- Ho Chi Minh City, Vietnam
| | | | - Minh Tho Nguyen
- Department of Chemistry
- University of Leuven
- B-3001 Leuven, Belgium
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Reddy SR, Mahapatra S. Theoretical study of photodetachment processes of anionic boron clusters. II. Dynamics. J Chem Phys 2012; 136:024323. [DOI: 10.1063/1.3675166] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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