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4th Alpine Conference on Solid State NMR, at France in Sept. 11-15, 2005 this is a SSNMR event organised by the Groupment Ampere subsequent to 17thEENC/32nd Ampere at Lille, France in Sept. 2004 This author did not attend the EUROMAR2005 at Veldhoven, The Netherlands
CLICK HERE to display the WebPage for this author's participations during Winter 2005-2006
For Curriculum Vitae of
Dr.S.Aravamudhan CLICK HERE
From:Ampere-EENC-2004 Conference
To: amudhan2000@rediffmail.com
Subject: Presentation of the EENC/AMPERE 2004 Conference.
Date: Wed, 14 Apr 2004 15:41:23 IST
17th EENC / 32nd AMPERE - Lille (FRANCE), September 2004
The joint conference will be held in Lille (FRANCE)
from 6th to 11th September 2004.
Devoted to all aspects of magnetic resonance,
the conference will gather numerous scientists
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Link to the WebSite of 17thEENC/32ndAmpere Conference;Sept.2004NEHU Chemistry
Link to the Webpage of Dept. of Chemistry NEHU, ShillongPersonal WebPage
Link to the Webpage built by Dr.S.Aravamudhan a link at NEHU WebSite
CLICK HERE For Curriculum Vitae of
Dr.S.Aravamudhan
ABSTRACT
Link to reach the displayed text of
submitted-Abstract
Regn. Fee Paid Link to display the 'Scanned'-fascimile
of Confirmation inserted:11thMay2004
Invitation Invitation from JP AMOUREX to Aravamudhan update posted on 20th June 2004
Abstract Accepted Contribution Accepted for POSTER Session by Organizing Committee update posted on 17th July 2004
For Stipend Application for STIPEND from Organizers Forwarded by N.E.H.University Acknowledgment awaited update posted on 2nd August 2004 GRANT of Euro 300/- from Organizers received
update posted on 14th Sept.2004
POSTER PO141 site The Poster Sheets displayed at Conference Can be downloaded from links update posted on 27th November 2004
AIR INDIA Fare-Certficate AirIndia Certificate for the Fare for Travel in the Relevant Sectors DEL-CDG-DEL update posted on 3rd August 2004
About Registration: Fees Paid by online Payment form on 10-05-2004 at 19:30 hrs . CLICK HERE to view payment confirmation.
-------------------
Registration fees:
students others
before May 31st for AMPERE Members
100 Euros 200 Euros
before May 31st for others 110 Euros 225 Euros
after June 1st
130 Euros 250 Euros
Student means born after January 1st, 1974. (an ID will be asked)
The registration fees can only be paid by an online payment.
The online payment will regroup the following
Student Rooms: Opted by Online Reservation
Student rooms are available: 11 Euros per night
Accomodation form are in Useful Information > Accomodation.
Hotel Rooms:
Hotel rooms are held by the Lille Tourism Office.
The reservation form is printable from the nmr2004 website.
Banquet:
A banquet is organized on Thursday evening.
The number of available places is limited to 400.
A banquet seat costs: 25 Euros
Student stipends: Application for Stipend
Forwarded from NEHU
A limited number of student stipends will be attributed in July.
The deadline for application for a student stipend is May 31st, 2004.
Applications for student stipends will only be taken into
account if Registration fees have been paid previously in time. A GRANT of Euro 300/- was
announced on arrival at the Venue on 4th Sept. 2004 and on
5th Sept.2004 the amount was paid on the spot.
A certficate to this effect of the award of the GRANT was also
provoded by the organizers
Cancellation:
In case of cancellation, your payment will be refunded as following:
- Totally before May 31st, 2004.
- Up to 75% between 1st and 30th, June 2004.
- Up to 50% between 1st and 31st, July 2004.
- NO refund after August 1st, 2004.
About Parallel Sessions:
------------------------
The following broad topics should be covered within the frame of parallel sessions:
- New liquid-state NMR experiments for biological applications.
- New solid-state NMR experiments for biological applications.
- New methodologies in solid-state NMR. - Materials as studied by magnetic resonances.Opted Oral Presentation Organizers accepted Contributionfor POSTER Session
- Magnetic resonance imaging and transport phenomena.
- EPR.
- Calculation of NMR/EPR parameters.
- NMR in biomedicine.
- Broad line NMR/EPR.
- Spin relaxation.
- Analytical applications of NMR.
- Paramagnetic systems.
- Emerging techniques.
Only one abstract will be accepted for each registered participant.Invitationfor participation
Deadline for receipt of abstracts to be considered for an oral presentation: April 30th, 2004
Deadline for receipt of abstracts to be considered for a poster: May 31st, 2004
Contact:
--------
The conference is co-chaired by:
- Jean-Paul AMOUREUX (Lille I University), jean-paul.amoureux@univ-lille1.fr
- Daniel CANET (Henri Poincare, Nancy I University), daniel.canet@rmn.uhp-nancy.fr
INDUCED FIELDS AND DEMAGNETIZATION; NUCLEAR SHIELDING AND LINESHAPES IN SOLID STATE NMR
Sankarampadi ARAVAMUDHAN
Department of Chemistry
North Eastern Hill University
Shillong (Meghalaya) 793022
INDIA
E Mail: saravamudhan@nehu.ac.in
It has been pointed out earlier that a simple programmable summation procedure can be used to calculate the demagnetization factors which otherwise require evaluation of elliptic integrals [1]. This summation procedure was a result of the extended consideration of the calculation of intermolecular shielding contributions for extracting the isolated molecule value for the proton shielding parameters from a measurement by the HR PMR techniques . The effort to find possibilities to reduce the stringency[2]of the requirement of a spherical sample for such measurement leads to the necessity to consider such a summation within the Lorentz ellipsoids [3]. These results now stand to be reconciled with the susceptibility effect measurements in liquid state HR PMR experiments[4]. This summation procedure seems to be valid for applying point dipole approximations, even for a macroscopic sample, to calculate the induced field outside and near the magnetized specimen[5]. The induced fields in and around the specimen using this method in solids and the comparison with liquids would be discussed.
1.http://saravamudhan.tripod.com/shield_demag_susceptibility/id1.html>
2. Ph.D., Dissertation of Bernd Tesche, 1995, Heidelberg University, Sec.2.3.1, p19.
3. http://geocities.com/amudhan_nehu/graphpresent.html
4. "The Time Averaged.....Experiments", W.C.Dickinson, Phys.Rev. 81, 717 (1951) pp 726-729
5. http://saravamudhan.tripod.com/id6.html
POSTER SITE PO141 CLICK HEREto display a WebPage from where the POSTER Presentation Sheets can be viewed CLICK HERE to display the list of other Web Pages of this author.
For Curriculum Vitae of
Dr.S.Aravamudhan CLICK HERE
FURTHER PARTICULARS ON THE REFERENCE #2 GIVEN ABOVE In the Submitted Abstract
"Die Magnetische Abschirmung von Protonen in Methylgruppen und aromatischen Ringen:
Multiple-NMR-Experimente an Molekulkristallen und ab-initio Rechnungen"
Inaugural-Dissertation zur Erlangung der Doktorwurde
der
Ruprecht-Karls-Universitat Heidelberg
On Fri, 24 Oct 2003 Ulrich Haeberlen wrote : A copy of the Text of Correspondence from Prof.Dr.Ulrich Haeberlen, Maxplanck Institute for Medical Research, Heidelberg, Germany
NOTES ADDED BY THE ADDRESSEE: Dr.S.Aravamudhan, are indicated by numbers inserted at appropriate places in the message below.
The TEXT of the notes appear after the text of the message.
Dear Sankarampadi or dear Aram, as we used to call you,
it was a real joy to receive mail from you and to learn that you are
still travelling to conferences and that you are still pondering on
questions initiated a long time ago in Heidelberg.
Actually, I have to think myself on such matters:
I am preparing a manuscript dealing with the question what the relations
are in the benzene molecule between the principal
shielding components and principal directions, fixed by molecular
symmetry. The eventual answer is this:
least shielded direction - perpend. to molec. plane; most shielded direction:
- in-plane-perpendicular-to-the-bond. Has that been known [1] to you?
The experiments were done on biphenyl, with particular
attention to the H-atom in para-position. Of course, the analysis of the
data requires knowledge of the intermolecular [2] shielding contributions.
Our approaches: point dipole calculation as in 1979 and ab-initio calculations for clusters.
If you are aware of any work [3] on proton shielding tensors (either expl.or theor., after 1995)
of aromatic systems, I would be very grateful to learn about it.
A few comments on your posters:
(1) So long as you shift all your small dipoles (length l) to the
midpoint of the large dipole (L), I would expect the result to be the same. [4]
Things will be different if the small dipoles are shifted to a variety (a distribution)
of different places.
(2) Ellipsoid: the more interesting situation is to have the
proton site and the small blue ellipsoid off-center from the large one.. [5]
(3) Be aware that nobody tries any more to measure proton shift
tensors via line narrowing multiple pulse sequences. In fact,nobody anymore has
the necessary equipment. If I am wrong, please let me know.
(4) Did you have a look at Prigl`s article in Adv.Magn.Reson.,Vol.19, 1996?
He actually used an ellipsoidal sample. Also, did you see
our 2001 deuteron NMR paper in JMR on Ca-formate? We claim it contains the most
accurate measurement of the shielding tensor of an H atom.
Best regards Ulrich Haeberlen
***************************
Dr.S.Aravamudhan,M.Sc.,Ph.D
Lecturer,North Eastern Hill University,Mawkynrow,Umshing,Shillong 793022
East Khasi Hills District
Meghalaya INDIA
Tel: 91 364 2550041/2722464
Fax: 91 364 2550486/2550076
EMail: amudhan2000@rediffmail.com
amudhan20012000@yahoo.co.in
saravamudhan@nehu.ac.in
***************************
NOTES
[1]."Pyromellitic acid dianhydride: crystal structure and anisotropic proton magnetic shielding"S.Aravamudhan et.al Molecular Physics,1979, Vol.38,No:1,241-255. particular page 249 (in the 2nd paragraph):....." In the case of protons attached to an aromatic ring, it is reasonable to expect the normal of the molecular plane to be the least shielded direction due to the deshielding effect of the ring current." and(in the 4th paragraph):....."it should be borne in mind that as long as we cannot predict the direction and size of the intermolecular contributions, there is no a priori reason to expect that the relation between the least shielded direction and the normal to the molecular plane should remain unaltered by the intermolecular contributions."
[2]." Intermolecular Contributions to the Chemical Shielding Anisotropy in Crystalline Benzene"T.Barbara, C.F.Wood, and B.P.Dailey., Journal of Magnetic Resonance, 1982, Vol.48., 225-233. particular page 232 (in the 2nd paragraph):...."A recent study of single crystal of pyromellitic acid dianhydride also shows increases in the asymmetry parameter and decreases in the anisotropy resulting from intermolecular effects (S.Aravamudhan et.al., Mol.Phys.,1979,Vol. 38, p241). The pyromellitic acid study is particularly interesting in that there is no molecular rotation, so that acomplete single crystal study yields the asymmetry parameter"........".The corrected tensor yields anisotropy =-5.43 ppm and asymmetry =0.6. An estimated contribution of 2 ppm from the carbonyl groups to the deshielding perpendicular to the aromatic plane can be used to give anisotropy =-3.44 ppm for an aromatic proton."
[4]. About this point a POSTER presentation was made in one of the National Symposia in Chemistry.This material is documented at the webpage built by this author exclusively for this purpose. Particularly the display SHEET-10 (CLICK here to download )contains the main argument for this point.In the reference cited for NOTE:[1] above, on page 252, below the equation-(3) the criticality of the point dipole approximation in certain contexts is discussed at length in the third paragraph of the page.
[5]. The power point file which was used for the presentation at the recently {7-20. February 2004}held National Symposium [NMRS2004]of the National Magnetic Resonance Society at Kolkata contains the main result similar to the point raised here. It is only required to add that,in the case of ellipsoid which is a weel established case of homogeneous magnetization for a uniform susceptibility of the specimen, placing the inner ellipsoid would only prove that the calculational procedure is valid if at all points within the same specimen the demagnetization factor value is the same. The presentation at NMRS2004 is on specimen shapes where in the magnetization is not homgeneous even for uniform susceptibility through out the specimen. CLICK HERE for an Abstract entitled..: "SHAPE DEPENDENT FIELD INHOMOGENEITY OF HOMOGENEOUS SPECIMEN: CONSEQUENCES IN HR PMR IN SOLIDS"
times since 27th Feb.2005
