7/23/2015 12:59:31 AMRefresher course in Chemistry; Sept.20-Oct.12, 2007 1 Magnetic Resonance Phenomenon is a manifestation due to the presence of INTRINSIC.

Презентация:



Advertisements
Похожие презентации
7/23/2015 1:08:36 AMInno Course Contents1 For the Quantization Effects on the Spin Angular Momentum in presence of External magnetic Field VIEW the powerpoint.
Advertisements

7/23/2015 1:07:26 AMPulsed NMR by Dr.S.Aravamudhan 1 P -X π/2 At t =0, the end of pulse External Magnetic Field Chemical substance Spin ensemble Z X Y.
Multiples Michael Marchenko. Definition In mathematics, a multiple is the product of any quantity and an integer. in other words, for the quantities a.
Schrodingers Equation for Three Dimensions. QM in Three Dimensions The one dimensional case was good for illustrating basic features such as quantization.
Michael Marchenko. In mathematics, a sequence is an ordered list of objects (or events). Like a set, it contains members (also called elements, or terms),
O O O O O O H H Proton Site with σ intra Organic Molecular single crystal : a specimen of arbitrary shape 4 point star indicates the molecule at a central.
Instructions For Viewing Use Only Microsoft Powerpoint XP Version to Enable Effectively All the Animation Features in the Following Slides Spinning Ellipse.
Electromagnetism. Electromagnetism is the branch of science concerned with the forces that occur between electrically charged particles. In electromagnetic.
General relativity. General relativity, or the general theory of relativity, is the geometric theory of gravitation published by Albert Einstein in 1916.
1 On A Laboratory, Magnetic Resonance Experimental Set up This is an Animated feature Viewable ONLY with the MS PowerPoint XP Version. Other versions.
1 APPLIED PHYSICS CODE : 07A1BS05 CODE : 07A1BS05 I B.TECH I B.TECH CSE, IT, ECE & EEE CSE, IT, ECE & EEE UNIT-4 UNIT-4 CHAPTER :1 CHAPTER :1 NO. OF SLIDES.
Prime numbers Michael Marcheko. Definition A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and.
7/23/2015 1:06:59 AMnuclear precession in magnetic field1 An Example for Classroom Demonstration An Introductory Illustration for the Nuclear Magnetic.
Maxwell's equations. Maxwell's equations are a set of partial differential equations that, together with the Lorentz force law, form the foundation of.
In mathematics, the notion of permutation is used with several slightly different meanings, all related to the act of permuting (rearranging) objects.
Centrifugal force (rotating reference frame). Centrifugal force (from Latin centrum "center" and fugere "to flee") can generally be any force directed.
Strings String theory is an active research framework in particle physics that attempts to reconcile quantum mechanics and general relativity. It is a.
Zorbing All about it. Zorbing it is sport Zorbing is an extreme sport in which a person slides down from the mountain or river. There are different types.
Blood type Blood type or blood group is a medical term. It describes the type of blood a person has. This blood type is based on whether or not there are.
1 APPLIED PHYSICS. 2 CODE : 07A1BS05 I B.TECH CSE, IT, ECE & EEE UNIT-2 NO. OF SLIDES : 18.
Транксрипт:

7/23/ :59:31 AMRefresher course in Chemistry; Sept.20-Oct.12, Magnetic Resonance Phenomenon is a manifestation due to the presence of INTRINSIC SPIN angular momentum and the associated Magnetic Moment characteristically in electrons and Nuclei When the experimental conditions are set for the NUCLEI to resonate, then it is the Nuclear Magnetic Resonance. A definition:

7/23/ :59:31 AMRefresher course in Chemistry; Sept.20-Oct.12, Spin and Magnetic moment: Nucleus rotates about an axis within itself, which is referred to as the spinning of nuclei. The spinning object acquires an angular momentum The NUCLEI thus possess angular momentum; and the angular momentum in atomic system are quantized. Due to this quantization, the angular momentum component in any chosen direction can take only specified discrete values. Spin Angular momentum Nucleus has electrical Charge. Thus a rotating charge has associated magnetic moment. For protons: Spin quantum number=1/2 The angular momentum and magnetic moment are in the same direction because of the positive charge of the nucleus Illustration:

7/23/ :59:31 AMRefresher course in Chemistry; Sept.20-Oct.12, When there is no magnetic field, then the Nuclear moment can be in any direction since in all orientations its potential energy would be the same When a magnetic field is externally applied………. The magnetic moment would tend to align along the direction of the magnetic field The nuclear magnetic moment is present along with the spin angular momentum which, as mentioned before, cannot take any arbitrary orientation. Thus the orientation of magnetic moment is restricted to only the orientations which are the possible orientations of angular momentum Interaction in presence of applied magnetic field

7/23/ :59:31 AMRefresher course in Chemistry; Sept.20-Oct.12, Thus even while the magnetic moment tends to align exactly along the magnetic field, the associated presence of angular momentum allows only discrete directions and the magnetic moment subtends a non-zero angle with the direction of the magnetic field. X Not possible Because of the fact that the complete alignment is not possible, a precession of the system of magnetic moment-angular momentum occurs in presence of the magnetic filed.