On the treatment of singularities of the Watson Hamiltonian for nonlinear molecules

The applicability of the Watson Hamiltonian for the description of nonlinear molecules—especially triatomic ones—has always been questioned, as the Jacobian of the transformation that leads to the Watson Hamiltonian, vanishes at the linear configuration. This results in singular behavior of the Watson Hamiltonian, giving rise to serious numerical problems in the computation of vibrational spectra, with unphysical, spurious vibrational states appearing among the physical vibrations, especially in the region of highly excited states. In this work, we analyze the problem and propose a simple way to confine the nuclear wavefunction in such a way that the spurious solutions are eliminated. We study the water molecule and observe an improvement compared with previous results. We also apply the method to the van der Walls molecule XeHe2.

Dr. Walter Watson

Professor of Sociology.

Welland Canal Survey of Lands John Watson, 1831

Survey map and description of John Watson's land created by The Welland Canal Company. Included is a written description of the land along with a drawing of the land. The land totals 2 acres, 1 road, and 21 perches. The land was surveyed on September 5th, 1831.

Letter - Lieut A. Watson Sime to Col. F.C. McCordick

A letter from Lieut. A. Watson to Col. F.C. McCordick dated only July 3rd. The letter reads "My dear Col. McCordick, If you haven't already heard, you will be surprised to get this letter from me - in Germany. It happened at that awful slaughter - the 3rd battle of Ypres, & even now when I think of it all, I doubt my reality of existence. Everything was O.K at 730am on the 2nd - a little morning hate in the way of trench mortars, that was all. I had just visited a few of my guns & had passed Gen.s Mercer & Williams & their aides, Lyman Gooderham and Fraser (two latter at this camp) on the way to the -- C.M.R Bn. Head Quarters when the storm broke. It last for 5 hours & by the time the Germans came over there were few left to oppose them. By a miracle, the 15 yard bay of the front line, where I was with 6 others, was not levelled like all the rest of the line & we did our best with rifle & bomb. I got a crack on the head & 3 hours later I found myself in a waterfilled shell hole. By night I tried to crawl back & through, but at dawn was caught. Am very comfortable here & glad to have company of Col. Usher, Capt. Light Bourne, Capt. Frank Park M.O. -- CMR) & about 20 other Canadians. Hope all is well with you & 35 - Good luck & best regards to all. A. Watson Sime, Lieut. Haus 62-B OFFIZIER-KRIEGSGEFANGENLAGER Gutersloh.

Wrestling Card - "Whipper" Bill Watson

The wrestler's name is "Whipper" Bill Watson and the number stamped on the reverse of the card is 692. His real name is William Potts and he was born in East York, Ontario. He is one of the best known Canadian wrestlers of all time and is a two time world champion. His honours include the Canadian Wrestling Hall of Fame.

L'éthique à l'écran. Compte-rendu de What's Good on TV? – Understanding Ethics Through Television, de Jamie Watson et Robert Arp, et de Seeing the Light – Exploring Ethics Through Movies, de Wanday Teays

Compte-rendu / Review

Self-study Language Modules Using Blackboard - Julie Watson

This is one of a series of short case studies describing how academic tutors at the University of Southampton have made use of learning technologies to support their students.

Watson-Crick base-pairing properties of tricyclo-DNA

Tricyclo-DNA belongs to the family of conformationally restricted oligodeoxynucleotide analogues. It differs structurally from DNA by an additional ethylene bridge between the centers C(3') and C(5') of the nucleosides, to which a cyclopropane unit is fused for further enhancement of structural rigidity. The synthesis of the hitherto unknown tricyclodeoxynucleosides containing the bases cytosine and guanine and of the corresponding phosphoramidite building blocks is described, as well as a structural description of a representative of an alpha- and a beta-tricyclodeoxynucleoside by X-ray analysis. Tricyclodeoxynucleoside building blocks of all four bases were used for the synthesis of fully modified mixed-base oligonucleotides. Their Watson-Crick pairing properties with complementary DNA, RNA, and with itself were investigated by UV melting curves, CD spectroscopy, and molecular modeling. Tricyclo-DNA was found to be a very stable Watson-Crick base-pairing system. A UV melting curve analysis of the decamers tcd(pcgtgacagtt) and tcd(paactgtcacg) showed increased thermal stabilities of up to DeltaT(m)/mod. = +1.2 degrees C with complementary DNA and +2.4 degrees C with complementary RNA. With itself, tricyclo-DNA showed an increase in stability of +3.1 degrees C/base pair relative to DNA. Investigations into the thermodynamic properties of these decamers revealed an entropic stabilization and an enthalpic destabilization for the tricyclo-DNA/DNA duplexes. CD spectroscopic structural investigations indicated that tricyclo-DNA containing duplexes preferrably exist in an A-conformation, a fact which is in agreement with results from molecular modeling