Narasimhan was married to Leena and the couple had two daughters, Nalini and Nandini, and a son, Vikram in between.[8] The family lived in Sunnyvale and it was here he died on 3 May 2013, at the age of 84, survived by his wife, children and six grand children. [3] Narasimhan was known to have been competent in carnatic music and performed at various stages as a flautist in the US and in India.[9]
Some of the important contributions from Narasimhan were in the field of computational chemistry and the work of his research school at the IITK was reported to have pioneered the discipline in India.[12] He and his colleagues developed indigenously-built phase locked super-regenerative oscillator-detectors and pulsed Nuclear quadrupole resonance (NQR) double resonance system. They also investigated the high resolution nuclear magnetic resonance of small molecules dissolved in liquid crystalline, the alternating linewidth in Electron Spin Resonance, coupling constants in nuclear magnetic resonance, and Sternheimer shielding and anti-shielding factors employing the Hartree–Fock method. His expertise in the field prompted the Institute of Nuclear Medicine and Allied Sciences to seek his assistance when they decided to establish one of the first magnetic resonance imaging facilities in the country which he successfully accomplished.[1] He also worked on developing a magnetic resonance microscopy as an imaging tool for biological research.[4]
Narasimhan published over 200 articles[13][note 1] in peer-reviewed journals and mentored 20 doctoral researchers.[4] His doctoral and masters students included Shridhar Ramachandra Gadre,[14] K. D. Sen, N. Chandrakumar, S Shankar, and Manvendra Krishna Dubey (MS 1979)[15] and he guided many researchers in their work.[16][17] He organized an active research school at the Indian Institute of Technology, Kanpur featuring scholars from physics and chemistry departments which worked on the theoretical and experimental aspects of magnetic resonance.[12] As the head of the department of chemistry, he assisted the department to develop into a centre of excellence in chemical research.[18] He was one of the founders of the Association of Magnetic Resonance Spectroscopists of India and served as its secretary. He was associated with the International Society of Magnetic Resonance as a member of its council and chaired the national advisory committee of the IX International Symposium on Nuclear Quadrupole Resonance held in Kanpur in 1988.[4] He also served as the general secretary of the National Academy of Sciences, India for four terms from 1977 to 1980.[19]
P. T. Narasimhan, S. V. Anantakrishnan (January 1953). "Dipole moments of camphor compounds - Part I". Proceedings of the Indian Academy of Sciences, Section A. a (a): a. doi:10.1007/BF03052679. S2CID92633988.
P. T. Narasimhan, S. V. Anantakrishnan (June 1953). "Dipole moments of camphor compounds - Part II". Proceedings of the Indian Academy of Sciences, Section A. 37 (6): 747–751. doi:10.1007/BF03052728. S2CID92188221.
Shankar S., Narasimhan P. T. (1984). "Linear coupled-cluster method. II. Analysis of local exchange-correlation potentials in beryllium and its isoelectronic series". Phys. Rev. 29 (1): 58–63. Bibcode:1984PhRvA..29...58S. doi:10.1103/physreva.29.58.
Narasimhan P. T., Ghosh Pratik, Fraser, S.E., Jacobs R.E (1994). "Magnetic resonance microscopy: challenges in biological imaging using a 500 MHz NMR microscope". Proceedings - Indian Academy of Sciences. Chemical Sciences. 27 (5).{{cite journal}}: CS1 maint: multiple names: authors list (link)