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Mallick, Babita ; Lakhsmanna, Adithya ; Umapathy, Siva (2011) Ultrafast Raman loss spectroscopy (URLS): instrumentation and principle Journal of Raman Spectroscopy, 42 (10). pp. 1883-1890. ISSN 0377-0486

Patil, N. R. ; Melavanki, R. M. ; Kapatkar, S. B. ; Chandrashekhar, K. ; Patil, H. D. ; Umapathy, Siva (2011) Fluorescence quenching of biologically active carboxamide by aniline and carbon tetrachloride in different solvents using Stern-Volmer plots Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 79 (5). pp. 1985-1991. ISSN 1386-1425

Singh, Bhawana ; Umapathy, Siva (2011) Effect of SDS on human hair: study on the molecular structure and morphology Journal of Biophotonics, 4 (5). pp. 315-323. ISSN 1864-063X

Melavankia, Raveendra M. ; Patil, N. R. ; Kapatkar, S. B. ; Ayachit, N. H. ; Umapathy, Siva ; Thipperudrappa, J. ; Nataraju, A. R. (2011) Solvent effect on the spectroscopic properties of 6MAMC and 7MAMC Journal of Molecular Liquids, 158 (2). pp. 105-110. ISSN 0167-7322

Mohapatra, Himansu ; Umapathy, S. (2010) Time-resolved resonance raman studies on proton-induced electron-transfer reaction from triplet excited state of 2-methoxynaphthalene to decafluorobenzophenone The Journal of Physical Chemistry A, 114 (47). pp. 12447-12451. ISSN 1089-5639

Fathima Parveen, M. ; Umapathy, S. ; Dhanalakshmi, V. ; Anbarasan, R. (2010) Synthesis and characterizations of nanosized iron(II) hydroxide and iron(II) hydroxide/poly(vinyl alcohol) nanocomposite Journal of Applied Polymer Science, 118 (3). pp. 1728-1737. ISSN 0021-8995

Mathavan, T. ; Umapathy, S. ; Jothirajan, M. A. ; Fatima Parveen, M. ; Vivekanandam, T. S. ; Soni, Ajay ; Okram, G. S. ; Ganesan, V. (2010) The unusual electrical response in polyaniline-threonine composites Materials Letters, 64 (18). pp. 2009-2011. ISSN 0167-577X

Chowdary, Praveen D. ; Umapathy, Siva (2010) Manifestation of conical intersections in resonance Raman intensities Journal of Raman Spectroscopy, 41 (3). pp. 310-319. ISSN 0377-0486

Umapathy, S. ; Mallick, B. ; Lakshmanna, A. (2010) Mode-dependent dispersion in Raman line shapes: observation and implications from ultrafast Raman loss spectroscopy The Journal of Chemical Physics, 133 (2). 024505_1-024505_6. ISSN 0021-9606

Fathima, Parveen M. ; Umapathy, S. ; Dhanalakshmi, V. ; Anbarasan, R. (2010) Synthesis and Characterization of Nano-sized Zn(OH)2 and Zn(OH)2/PVA Nano-composite Composite Interfaces, 17 (8). pp. 757-774. ISSN 0927-6440

Balakrishnan, G. ; Sahoo, S. K. ; Chowdhury, B. K. ; Umapathy, Siva (2010) Understanding solvent effects on structure and reactivity of organic intermediates: a Raman study Faraday Discussions, 145 . pp. 443-466. ISSN 0301-7249

Mohapatra, Himansu ; Umapathy, Siva (2009) Influence of solvent on photoinduced electron-transfer reaction: time-resolved resonance Raman study The Journal of Physical Chemistry A, 113 (25). pp. 6904-6909. ISSN 1089-5639

Umapathy, Siva ; Lakshmanna, Adithya ; Mallick, Babita (2009) Ultrafast Raman loss spectroscopy Journal of Raman Spectroscopy, 40 (3). pp. 235-237. ISSN 0377-0486

Fathima Parveen, M. ; Umapathy, S. ; Dhanalakshmi, V. ; Anbarasan, R. (2009) Synthesis and characterizaion of nanosized Mg(OH)₂ and its nanocomposite with poly (vinyl alcohol) Nano, 4 (3). pp. 147-156. ISSN 1793-2920

Fathima Parveen, M. ; Umapathy, S. ; Dhanalakshmi, V. ; Anbarasan, R. (2009) Synthesis and characterizations of nano-sized Ni(OH)₂ and Ni(OH)₂/poly(vinyl alcohol) nano composite Journal of Materials Science, 44 (21). pp. 5852-5860. ISSN 0022-2461

Deckert, V. ; George, M. W. ; Umapathy, S. (2008) Raman spectroscopy at the beginning of the Twenty-First Century Journal of Raman Spectroscopy, 39 (11). pp. 1508-1511. ISSN 0377-0486

Chowdary, P. D. ; Umapathy, S. (2008) Ultrafast dynamics and photochemistry of π-π* excited trans- azobenzene-a comprehensive analysis of resonance Raman intensities Journal of Raman Spectroscopy, 39 (11). pp. 1538-1555. ISSN 0377-0486

Jothi Rajan, M. A. ; Mathavan, T. ; Vivekanandam, T. S. ; Umapathy, S. ; Ganesan, V. ; Okram, G. S. ; Soni, Ajay (2008) Sonochemical synthesis of poly (methyl acrylate) Solid State Phenomena, 136 . pp. 175-190. ISSN 1012-0394

Vivekanandam, T. S. ; Gopalan, A. ; Vasudevan, T. ; Umapathy, S. (2005) Sonochemical cyclopolymerization of diallylamine in the presence of peroxomonosulfate Journal of Applied Polymer Science, 98 (4). pp. 1548-1553. ISSN 0021-8995

Jothi Rajan, M. A. ; Thaddeus, Arockiam ; Mathavan, T. ; Vivekanandam, T. S. ; Umapathy, S. (2005) Construction of a low cost photoacoustic spectrometer for characterization of materials Macromolecular Symposia, 222 (1). pp. 287-296. ISSN 1022-1360

Mohapatra, Himansu ; Umapathy, Siva (2004) Time resolved resonance Raman studies on triplet excited state of 2-methoxy-naphthalene by photo-sensitization Chemical Physics Letters, 390 (4-6). pp. 427-432. ISSN 0009-2614

Abraham, B. ; Sastri, C. V. ; Maiya, B. G. ; Umapathy, S. (2004) Resonance Raman spectroscopic studies of [Ru(phen)₂qdppz]²⁺ and its interactions with calf thymus DNA Journal of Raman Spectroscopy, 35 (1). pp. 13-18. ISSN 0377-0486

Biswas, Nandita ; Umapathy, Siva (2003) Resonance Raman study of the solvent dynamics for ultrafast charge transfer transition in 4-nitro-4'-dimethylamino-azobenzene The Journal of Chemical Physics, 118 (12). pp. 5526-5536. ISSN 0021-9606

Biswas, Nandita ; Abraham, Becky ; Umapathy, Siva (2002) Investigation of short-time isomerization dynamics in p-nitroazobenzene from resonance Raman intensity analysis The Journal of Physical Chemistry A, 106 (41). pp. 9397-9406. ISSN 1089-5639

Mohapatra, Himansu ; Umapathy, Siva (2002) Time-resolved resonance raman spectroscopic studies on the radical anions of methyl-1,4-benzoquinone and 2,6-dimethyl-1,4-benzoquinone The Journal of Physical Chemistry A, 106 (18). pp. 4513-4518. ISSN 1089-5639

Puranik, Mrinalini ; Umapathy, Siva (2002) Excited state structure and dynamics of p-benzoquinone and bromanil from time-resolved resonance Raman spectra and simulation Bulletin of the Chemical Society of Japan, 75 (5). pp. 1057-1064. ISSN 0009-2673

PugŽlys, Audrius ; den Hartog, Harald P. ; Baltuška, Andrius ; Pshenichnikov, Maxim S. ; Umapathy, Siva ; Wiersma, Douwe A. (2001) Solvent-controlled acceleration of electron transfer in binary mixtures The Journal of Physical Chemistry A, 105 (51). pp. 11407-11413. ISSN 1089-5639

Puranik, Mrinalini ; Umapathy, Siva ; Snijders, Jaap G. ; Chandrasekhar, Jayaraman (2001) Structure of the triplet excited state of bromanil from time-resolved resonance Raman spectra and simulation Journal of Chemical Physics, 115 (13). pp. 6106-6114. ISSN 1674-0068

Biswas, Nandita ; Umapathy, Siva (2001) Study of solvent effects on the molecular structure and the reorganization energies of 4-nitro-4'-dimethylaminoazobenzene using resonance Raman intensities Journal of Raman Spectroscopy, 32 (6-7). pp. 471-480. ISSN 0377-0486

Puranik, Mrinalini ; Chandrasekhar, Jayaraman ; Umapathy, Siva (2001) Structure of the triplet excited state of tetrabromo-p-benzoquinone from time-resolved resonance Raman spectra and ab initio calculations Chemical Physics Letters, 337 (1-3). pp. 224-230. ISSN 0009-2614

Kwok, W. M. ; Ma, C. ; Matousek, P. ; Parker, A. W. ; Phillips, D. ; Toner, W. T. ; Towrie, M. ; Umapathy, S. (2001) A determination of the structure of the intramolecular charge transfer state of 4-dimethylaminobenzonitrile (DMABN) by time-resolved resonance Raman spectroscopy The Journal of Physical Chemistry A, 105 (6). pp. 984-990. ISSN 1089-5639

Puranik, Mrinalini ; Chandrasekhar, Jayaraman ; Snijders, Jaap G. ; Umapathy, Siva (2001) Time-resolved resonance Raman and density functional studies on the ground state and short-lived intermediates of tetrabromo-p-benzoquinone Journal of Physical Chemistry A, 105 (46). pp. 10562-10569. ISSN 1089-5639

Kwok, W. M. ; Gould, I. ; Ma, C. ; Puranik, M. ; Umapathy, S. ; Matousek, P. ; Parker, A. W. ; Phillips, D. ; Toner, W. T. ; Towrie, M. (2001) Vibrational studies of ground state 4-dimethylaminobenzonitrile (DMABN) and its ring deuterated isotopomer DMABN-d₄ Physical Chemistry Chemical Physics, 3 (12). pp. 2424-2432. ISSN 1463-9076

Anandhi, R. ; Umapathy, S. (2000) Intermolecular hydrogen abstraction from triplet excited state of decafluorobenzophenone: a Raman investigation Journal of Raman Spectroscopy, 31 (4). pp. 331-338. ISSN 0377-0486

Biswas, Nandita ; Umapathy, Siva (2000) Structures, vibrational frequencies, and normal modes of substituted azo dyes: infrared, Raman, and density functional calculations The Journal of Physical Chemistry A, 104 (12). pp. 2734-2745. ISSN 1089-5639

Vivekanandam, T. S. ; Gopalan, A. ; Vasudevan, T. ; Umapathy, S. (2000) Sonochemical cyclopolymerization of diallylamine European Polymer Journal, 36 (2). pp. 385-392. ISSN 0014-3057

Balakrishnan, G. ; Umapathy, S. (1999) Photogenerated radical intermediates of vitamin K₁: a time-resolved resonance Raman study Journal of Molecular Structure, 475 (1). pp. 5-11. ISSN 0022-2860

Vivekanandama, T. S. ; Gopalan, A. ; Vasudevana, T. ; Umapathy, S. (1999) Polymerization of acrylamide in the presence of peroxodisulfate and ultrasound Polymer, 40 (3). pp. 807-811. ISSN 0032-3861

Anandhi, R. ; Umapathy, S. (1998) Resonance Raman spectroscopic studies on the conducting state of polyvinylcarbazole and its model compounds Journal of Raman Spectroscopy, 29 (10-11). pp. 901-906. ISSN 0377-0486

Biswas, Nandita ; Umapathy, Siva (1998) Partitioning of the total reorganization energy into its vibrational and solvent (inertial and reorientational) contributions using resonance Raman intensities Chemical Physics Letters, 294 (1-3). pp. 181-190. ISSN 0009-2614

Lednev, I. K. ; Yea, T.-Q. ; Matousek, P. ; Towrie, M. ; Foggi, P. ; Neuwahl, F. V. R. ; Umapathy, S. ; Hestera, R. E. ; Moore, J. N. (1998) Femtosecond time-resolved UV-visible absorption spectroscopy of trans-azobenzene: dependence on excitation wavelength Chemical Physics Letters, 290 (1-3). pp. 68-74. ISSN 0009-2614

Biswas, Nandita ; Umapathy, Siva (1998) Simple approach to determining absolute Raman cross sections using an optical parametric oscillator Applied Spectroscopy, 52 (4). pp. 477-628. ISSN 0003-7028

Balakrishnan, Gurusamy ; Mohandas, Pothukattil ; Umpathy, Siva (1997) Ab initio studies on structure and vibrational spectra of ubiquinone and its radical anion Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 53 (10). pp. 1553-1561. ISSN 1386-1425

Biswas, Nandita ; Umapathy, Siva (1997) Density functional calculations of structures, vibrational frequencies, and normal modes of trans- and cis-Azobenzene The Journal of Physical Chemistry A, 101 (30). pp. 5555-5566. ISSN 1089-5639

Mohandas, Pothukattil ; Umapathy, Siva (1997) Density-functional studies on the structure and vibrational spectra of transient intermediates of p-benzoquinone The Journal of Physical Chemistry A, 101 (24). pp. 4449-4459. ISSN 1089-5639

Anandhi, R. ; Rajesh, C. S. ; Das, Suresh ; Umapathy, S. (1997) Transient absorption studies on 3,6-dibromo polyvinylcarbazole and its model compounds Journal of Photochemistry and Photobiology A: Chemistry, 106 (1-3). pp. 135-139. ISSN 1010-6030

Balakrishnan, G. ; Umapathy, S. (1997) Intermolecular hydrogen atom abstraction from the fluoranil triplet excited state: a Raman study Chemical Physics Letters, 270 (5-6). pp. 557-563. ISSN 0009-2614

Biswas, Nandita ; Umapathy, Siva (1997) Resonance de-enhancement in the 2¹A_g state of trans-azobenzene Pramana - Journal of Physics, 48 (4). pp. 937-950. ISSN 0304-4289

Biswas, Nandita ; Umapathy, Siva (1997) Early time dynamics of trans-azobenzene isomerization in solution from resonance Raman intensity analysis The Journal of Chemical Physics, 107 (19). pp. 7849-7858. ISSN 0021-9606

Balakrishnan, Gurusamy ; Umapathy, Siva (1997) Time-resolved resonance Raman spectroscopic studies on the triplet excited state of fluoranil Journal of the Chemical Society, Faraday Transactions, 93 (23). pp. 4125-4130. ISSN 0956-5000

Babaei, Ali ; Connor, Paul A. ; James McQuillan, A. ; Umapathy, Siva (1997) UV-visible spectrooelectrochemistry of the reduction products of anthraquinone in dimethylformamide solutions: an advanced undergraduate experiment Journal of Chemical Education, 74 (10). pp. 1200-1204. ISSN 0021-9584

Balakrishnan, Gurusamy ; Mohandas, Pothukattil ; Umapathy, Siva (1996) Time-resolved resonance Raman spectroscopic studies on the radical anions of menaquinone and naphthoquinone The Journal of Physical Chemistry A, 100 (41). pp. 16472-16478. ISSN 1089-5639

Biswas, N. ; Umapathy, S. ; Kalyanaraman, C. ; Sathyamurthy, N. (1995) Resonance Raman intensity analysis of polyatomic molecules Proceedings of the Indian Academy of Sciences - Chemical Sciences, 107 (3). pp. 233-244. ISSN 0253-4134

Engerta, Christian ; Umapathy, Siva ; Kiefer, Wolfgang ; Hamaguchi, Hiro-o (1994) Dynamic structure of charge carrier in polyaniline by near-infrared excited resonance Raman spectroscopy Chemical Physics Letters, 218 (1-2). pp. 87-92. ISSN 0009-2614

Parker, Anthony W. ; Hester, Ronald E. ; Phillips, David ; Umapathy, Siva (1992) Time-resolved resonance Raman spectroscopic investigations of the photochemistry of ubiquinone Journal of the Chemical Society, Faraday transactions, 88 (18). pp. 2649-2653. ISSN 0956-5000

Umapathy, S. ; Cartner, A. M. ; Parker, A. W. ; Hester, R. E. (1990) Time-resolved resonance Raman spectroscopic studies of the photosensitization of colloidal titanium dioxide The Journal of Physical Chemistry, 94 (26). pp. 8880-8885. ISSN 0092-7325

Umapathy, S. ; Hester, R. E. (1990) Laser Raman spectroscopy of colloidal semiconductor photosensitizers Proceedings of the Indian Academy of Sciences - Chemical Sciences, 102 (5). pp. 613-628. ISSN 0253-4134

Umapathy, S. ; Hester, R. E. (1990) Raman spectroscopic studies of polypryrrole on colloidal TiO₂: evidence for bipolarons Journal of Molecular Structure, 224 . pp. 113-119. ISSN 0022-2860

Umapathy, S. ; McQuillan, A. J. ; Hester, R. E. (1990) An in situ resonance Raman and infrared spectroscopic study of hexacyanoferrate (II) ion adsorbed to aqueous colloidal TiO₂ Chemical Physics Letters, 170 (1). pp. 128-132. ISSN 0009-2614

Gamage, Ranjith S. K. A. ; Umapathy, Siva ; James McQuillan, A. (1990) OTTLE cell study of the UV-visible and FTIR spectroelectrochemistry of the radical anion and dianion of 1,4-benzoquinone in DMSO solutions Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 284 (1). pp. 229-235. ISSN 0022-0728

Umapathy, S. ; Lee-Son, G. ; Hester, R. E. (1989) Raman spectroscopic studies of substituted bipyridines, their ruthenium(II) complexes and surface-derivatized TiO₂ Journal of Molecular Structure, 194 . pp. 107-116. ISSN 0022-2860

Umapathy, Siva ; Lee-Son, Gillian ; Hester, Ronald E. (1987) Resonance Raman spectroscopic studies of surface-derivatized TiO₂ Journal of the Chemical Society, Chemical Communications, 1987 (24). pp. 1841-1842. ISSN 0022-4936

Umapathy, S. ; Kesavasamy, K. ; Krishnamurthy, N. (1980) Second order Raman spectrum of carbon disulphide in the condensed phase Journal of Raman Spectroscopy, 9 (3). pp. 144-149. ISSN 0377-0486