Synchrotron based spectroscopic investigation of N,N-dimethylacetamide

被引:1
作者
Singh, Param Jeet [1 ]
Das, A. K. [1 ]
Gorai, Kiran Kumar [1 ]
Shastri, A. [1 ,2 ]
Sunanda, K. [1 ]
Udupa, D., V [1 ,2 ]
Rajasekhar, B. N. [1 ,2 ]
机构
[1] BARC, Atom & Mol Phys Div, Mumbai 400094, Maharashtra, India
[2] Homi Bhabha Natl Inst, Mumbai, Maharashtra, India
关键词
N; N-dimethylacetamide DMA; Synchrotron radiation; Vacuum ultraviolet; Excited states; Infrared; PHOTOABSORPTION; EXTRACTION; ACETONE; AMIDES;
D O I
10.1016/j.jqsrt.2022.108092
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Spectroscopic investigations are presented for N,N-dimethylacetamide (DMA) in vacuum ultraviolet (VUV) (5-11 eV) and infrared (IR) (570-3200 cm(-1)) regions. The VUV photoabsorption spectrum of DMA is recorded using synchrotron radiation source. Analysis of experimentally observed spectra is supported with quantum chemical computations. Calculations are performed for geometry optimization of neutral and cationic ground states, molecular orbital plots and potential energy curves of ground and excited states using B3LYP/cc-pVQZ level of theory. Vertical excited singlet and triplet state energies are calculated at the B3LYP/cc-pVQZ and CAMB3LYP/aug-cc-pVTZ levels of theory. Assignments of vibrational bands observed in the IR spectrum are made based on the present computational work and available literature. Experimentally observed peaks in the VUV region are assigned to Rydberg series and valence states by correlating with computed values. Rydberg series for VUV spectrum are extended compared to earlier literature and a few new vibrational assignments are proposed for the IR spectrum. The plots of the PECs for the first few excited states along the various bond lengths show a few avoided crossings of low lying valence and Rydberg states in the Franck-Condon region indicating contribution of Rydberg states in the dissociation dynamics of the molecule on photoexcitation in the VUV region. Present work is a comprehensive spectroscopic study of DMA in the VUV and IR regions. (C) 2022 Elsevier Ltd. All rights reserved.
引用
收藏
页数:9
相关论文
共 35 条
[1]  
Agency E.C, 2014, OP PROP HARM CLASS L
[2]  
[Anonymous], 1966, ELECT SPECTRA ELECT
[3]   Separation of Am(III) and trivalent lanthanides from simulated high-level waste using a hollow fiber-supported liquid membrane [J].
Ansari, S. A. ;
Mohapatra, P. K. ;
Raut, D. R. ;
Adya, V. C. ;
Thulasidas, S. K. ;
Manchanda, V. K. .
SEPARATION AND PURIFICATION TECHNOLOGY, 2008, 63 (01) :239-242
[4]   Comparative dispersion-free solvent extraction of Uranium(VI) and Thorium(IV) by TBP and dialkyl amides using a hollow fiber contactor [J].
Ansari, S. A. ;
Kumari, Neelam ;
Raut, D. R. ;
Kandwal, P. ;
Mohapatra, P. K. .
SEPARATION AND PURIFICATION TECHNOLOGY, 2016, 159 :161-168
[5]   CHARGE LOCATION AND FRAGMENTATION UNDER ELECTRON-IMPACT .5. IONIZATION-POTENTIALS OF (METHYLATED) PHOSPHORAMIDES, GUANIDINES, FORMAMIDES, ACETAMIDES, UREAS AND THIOUREAS [J].
BALDWIN, MA ;
LOUDON, AG ;
WEBB, KS ;
CARDNELL, PC .
ORGANIC MASS SPECTROMETRY, 1977, 12 (05) :279-282
[6]  
Basch H, J CHEM PHYS, V196, P5007
[7]   The liquid structure of the solvents dimethylformamide (DMF) and dimethylacetamide (DMA) [J].
Basma, N. ;
Cullen, P. L. ;
Clancy, A. J. ;
Shaffer, M. S. P. ;
Skipper, N. T. ;
Headen, T. F. ;
Howard, C. A. .
MOLECULAR PHYSICS, 2019, 117 (22) :3353-3363
[8]   DENSITY-FUNCTIONAL THERMOCHEMISTRY .3. THE ROLE OF EXACT EXCHANGE [J].
BECKE, AD .
JOURNAL OF CHEMICAL PHYSICS, 1993, 98 (07) :5648-5652
[9]   MacMolPlt: A graphical user interface for GAMESS [J].
Bode, BM ;
Gordon, MS .
JOURNAL OF MOLECULAR GRAPHICS & MODELLING, 1998, 16 (03) :133-+
[10]  
Chalapathi V. V., 1968, Proceedings of the Indian Academy of Sciences, Section A, V68, P109