Prof Chakraborty did his Ph.D. on the "Design and development of a radio-frequency (RF) quadrupole mass spectrometer (QMS) for the study of secondary-ions emitted from ion-bombarded metal surfaces". The QMS was initially fabricated by Profs S D Dey, S B Karmohapatro and B M Banerjee at Saha Institute of Nuclear Physics, Kolkata, India.