Deb started his career which spanned across several institutions at Indian Association for the Cultivation of Science as a CSIR pool officer in 1969 but a year later, moved to the Indian Institute of Technology, Mumbai as a member of faculty.[1] In 1971, he was appointed as an assistant professor at the Birla Institute of Technology and Science, Pilani but after a brief stint of one year, he returned to IIT Mumbai where he spent the next 12 years, serving as an assistant professor (1973–78) and as a professor (1978–84).[7] His next move was to Panjab University as the professor of theoretical chemistry in 1984 and after a service of two decades he superannuated from there in 2004. Post-retirement, he moved to S. N. Bose National Centre for Basic Sciences, Kolkata as ISRO Vikram Sarabhai Research Professor under the Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore. In 2007, he took up an Adjunct/Visiting Professorship at the newly established Indian Institute for Science Education and Research, Kolkata. Currently, he serves [8] as an INSA Senior Scientist and Honorary Scholar-in-Residence at Visva-Bharati University.[9]
Legacy
Deb's main contributions are in the field of theoretical chemistry and the molecular geometry model he developed to demonstrate the influence of electronuclear attractive force and the highest occupied molecular orbital in the determination of molecular shapes is reported to be a notable one.[10] His work on the applicability of the concept of internal stresses of molecules and solids revealed their relation to the density-functional theory and quantum fluid dynamics. He developed methodologies for predicting new molecules using quantum chemistry and for combining cellular automata with Thomas-Fermi-Dirac theory.[4]
One of the early pioneers of the electron density theory in chemistry, Deb's main focus was on developing the foundations for a possible density-based alternative quantum mechanics bypassing the Schrödinger equation and the many-electron wave-function. He emphasized the general interpretative aspects of the electron density in chemistry. For both these ends, he concentrated on developing a single time-dependent equation (the Deb-Chattaraj or DC equation) for the direct calculation of electron density, which is different from the usual density functional theory.
His researches have been documented in many articles published in journals of repute[11][note 1] and he has published two books, The Force Concept in Chemistry[12] and The Single-Particle Density in Physics and Chemistry.[13] Besides, he has also written about holistic education as well as on Satyajit Ray, one of the pioneers of modern Indian cinema.[14] His writings have been cited by many authors[note 2] and he has guided seventeen doctoral and post-doctoral scholars in their studies. He was also involved with curriculum designing programs and seminars[15] and has been associated with science journals as a member of their editorial boards.[4][16]
Prof. Deb is widely considered as a scholar of arts and literature of both eastern and western worlds. Recently his lifelong enthusiasm and passion for Indology and its connection to the world heritage is culminated in the book "The peacock in splendour: Science, literature and arts in ancient and medieval India". "A result of long and painstaking research over many years, this refreshing and structured book is a pioneering effort to examine the intellectual dimensions of Indian holism. It provides an encyclopedic and illuminating account of the three major entangled strands of Indian Science, Literature and Art covering nearly 5,000 years of the holistic Indian civilization, from about 3300 B.C. to around 1600 A.D. This book will be an exciting read for not only intelligent and interested laypersons, but also for students, teachers and scholars in sciences, technologies, humanities – including fine arts and performing arts – as well as social sciences."
Deb's passion for teaching encompassed being true to all his students and to the subjects being taught. His teaching methods were all student-centred. Even when teachers from other institutions sat in his classes, they became his students. Deb adopted primarily a chalk-and-blackboard approach, with every mathematical equation written on the blackboard being physically interpreted. In case difficult/ complicated diagrams were to be shown, he used different methods of presentation in which 4 colours were invariably employed for visual appeal, inspired by the topological 4-colour map concept.
Deb adopted a median level of teaching with encouragement to all students to face their own intellectual challenges. His discourses emphasized on students’ understanding of the concepts because, according to Deb, “concepts are the fragrance of science”. He encouraged students to ask questions (“no questions are stupid”) in the classroom and to use the library as much as possible. He also advised them to be very strong in fundamentals so they could tackle unknown problems fearlessly.
Deb sought to keep students constantly interested in the subject at hand. Two notable aspects in this instance are: (i) In a longish derivation, he would casually introduce a twist for unsuspecting students and finally obtain a result which was unacceptable and could even be ridiculous. (ii) In a spectroscopy course – which would show the students many peaks - Deb took all the students along with a blackboard and chalk to the top of a 500-foot hill (which he had already climbed) to teach them molecular spectra and molecular structure on a few occasions. Deb felt it was necessary for students to realize that “innovations cannot become routine and must remain unpredictable”. The only external influence in Deb's teaching of any course was that it should be at par with the best teaching available globally on that course and he never followed any icon.
Over a span of 45 years, Deb has delivered invited series of lectures at national workshops on chemistry, physics and mathematics, and numerous seminar/special lectures in chemistry and physics departments in India and abroad. He had also communicated excitement in chemical sciences and science in general, through instructional lectures to high school as well as junior college students. He has frequently used examples from Indian and western art in both expert and educational lectures.
Deb's philosophy of holistic science education in general and chemical education in particular, is encapsulated through his own words : "Learning of sciences cannot be achieved satisfactorily by confining different subjects into separate air-tight compartments each of which may further have air-tight sub-compartments. Science learning has to be multi-disciplinary and liberal, roaming across boundaries, with an understanding of aesthetics and fine arts as well.” This educational philosophy has been laid down in detail in a number of articles in journals, namely, Science and Culture (Kolkata), Journal of Higher Education (UGC, New Delhi), Social Sciences Research Journal (Chandigarh), Current Science (Bangalore), Journal of Chemical Education (USA) as well as in a number of invited lectures at national-level symposia/ conferences on education.
Deb has played a significant role as a conceptualiser and as a member/convener of the various institutional and national committees involved in upgrading and modernisation of quite a few prominent educational curricula in India. He has always been available as a friend, philosopher and guide to his students and young faculty members. His life-long passion about understanding and application of concepts have also played a very important role in his research.
Deb, B. M. (1974). "A simple mechanical model for molecular geometry based on the Hellmann-Feynman theorem. I. General principles and applications to AH2, AH3, AH4, HAB and ABC molecules". J. Am. Chem. Soc. 96 (7): 2030–2044. doi:10.1021/ja00814a009.
Deb, B. M.; Bamzai, A. S. (1979). "Internal stresses in molecules. II. A local view of chemical binding in the H2 molecule". Mol. Phys. 38 (6): 2069–2097. doi:10.1080/00268977900103061.
Deb, B. M.; Ghosh, S. K. (1979). "On some local force densities and stress tensors in molecular quantum mechanics". J. Phys. B: At. Mol. Phys. 12 (23): 3857–3872. Bibcode:1979JPhB...12.3857D. doi:10.1088/0022-3700/12/23/013.
Deb, B. M.; Ghosh, S. K. (1982). "Quantum fluid dynamics of many-electron systems in three-dimensional space". Int. J. Quantum Chem. 22 (5): 871–888. doi:10.1002/qua.560220503.
Deb, B. M.; Ghosh, S. K. (1983). "New method for the direct calculation of electron density in many-electron systems. I. Application to closed-shell atoms". Int. J. Quantum Chem. 23: 1–26. doi:10.1002/qua.560230104.
Deb, B. M.; Chattaraj, P. K. (1984). "The role of kinetic energy in density-functional theory". J. Sci. Ind. Res. 43: 238–249.
Deb, B. M.; Chattaraj, P. K. (1989). "Density functional and hydrodynamical approach to ion-atom collisions through a new generalized nonlinear Schrödinger equation". Phys. Rev. A. 39 (4): 1696–1713. Bibcode:1989PhRvA..39.1696D. doi:10.1103/physreva.39.1696. PMID9901424.
Dey, B. K.; Deb, B. M. (1995). "Time-dependent quantum fluid dynamics of the photoionization of He atom under an intense laser field". Symposium on Thirty Years of Density Functional Theory 1994, Int. J. Quantum Chem. 56 (6): 707–732. doi:10.1002/qua.560560608.
Singh, R.; Deb, B. M. (1996). "Density Functional calculation for doubly excited auto-ionizing states of helium atom". J. Chem. Phys. 104 (15): 5892–5897. Bibcode:1996JChPh.104.5892S. doi:10.1063/1.471321.
Roy, A. K.; Singh, R.; Deb, B. M. (1997). "Density functional calculations for doubly excited states of He, Li+, Be++ and B+++". J. Phys. B: At. Mol. Opt. Phys. 30: 4763–4782. doi:10.1088/0953-4075/30/21/014. S2CID250904326.
Roy, A. K.; Dey, B. K.; Deb, B. M. (1999). "Direct calculation of ground-state electronic densities and properties of noble gas atoms through a single time-dependent hydrodynamical equation". Chem. Phys. Lett. 308 (5): 523–531. Bibcode:1999CPL...308..523R. doi:10.1016/S0009-2614(99)00612-0.
