Spectroscopy deals with the interactions
between electromagnetic radiation and matter.
How the matter is influenced depends on the
wavelength or frequency of the radiation.
Scientists use spectroscopy to derive the
properties of matter at the molecular level.
Nuclear magnetic resonance (NMR) is a special
branch of spectroscopy, exploiting the magnetic
properties of atomic nuclei.
NMR was discovered
1945 in USA by Bloch and Purcell
(Nobel Prize in physics 1952).
Reminiscences of the Early Days of
Nuclear Magnetic Resonance at Stanford University
by Warren G. Proctor, Research Laboratory,Varian AG, written around 1967.
Bloch and Purcell discovered NMR
which was observed by a Continuous
RF Irradiation of Spin System in a Magnetic Field
while ERWIN HAHN
demonstrated the Pulsed Transient
NMR Response of Spin System with home-built Pulsed
NMR Spectrometer. Experiments of E. L. Hahn
have been described in this article
Web Page created on 25th September 2016 at Shillong Last updated on..20th March.2017..Shillong
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PowerPoint Presentation Files for
INTRODUCING Nuclear Magnetic Resonance: in Schools & Colleges
From the contents of webdirectory of S Aravamudhan
This part added on to this page on 7th Oct.2016 at Shillong
Make a beginning with self learning in Information and Communication Technology tools with specific reference to teaching of Chemistry and spectroscopy: http://saravamudhan.tripod.com/infotech_tools/
A Webpage to begin with I.C.T:- IT-Classroom-Tools
And, eventually find yourself publishimg on educational technology ! An excerpt from the article(cited as hotlink below):
Most of such facilities have come about by thinking innovatively in bringing science and technology to the door steps of common people, and innovative thinking is about how to put the information technology into effective use than making available these I.T. tools for fissiparous trends. While learning to use the IT tools, it should be ensured, that it is by a responsible training, not by obtrusive and wasteful trends and tendencies - even if it is self-learning. A certain level of maturity (not merely a qualification of experience) is required to minimize the dissipation and conserve the resources, reduce the wear-and-tear damages and insist on durability and dependability. Some instances would require local wisdom, more than broad based information and knowledge of the subject matter. A publication could come through during the Chennai Visit (for the particpation in 10th Midyear CRSI Symposium,Trichy, July 23-25,205: the next event EVENT-07) to elaborate on this observation as above:-
This add-on information pertains to the PPT files "03 Enesmble Magnetization Relaxation T1 & T2";"04 Detection Princples; spectrum" and "07 Transition Rates; Relaxation Times; CW & Pulse technique" . The spin-lattice relaxation process involves an exchange of energy between the Spin system (spin degrees of freedom) and the lattice (other degrees of freedom than the spins). Which means when the Spin absorbs energy from radiation due to resonance, there is an increase in spin system energy due to the energy absorbed from Electromagnetic Radiation. Then spin system equilibrates with lattic, the lattice would get more energy dissipated from the spin system. This can manifest as an increase in the temperature os the sample, and the following observation by George Feher is precisely on such considerations:
Observation of EPR lines using temperature modulation;--by--
G. Feher, R.A. Isaacson, and J.D. McElroy; --in--
Rev. Sci. Instr. 40, #12, 1640-1641 (December 1969).
Possible self-learning exercises with MS OFFICE application; on the basic aspects of Obtaining NMR spectra Video feature added on 1st May 2017: Shillong