Home About us Contact
|
Home About us Contact | ||
|
|
||
Parity Violation (parity + violation)
Selected AbstractsMode-selective stereomutation tunneling as compared to parity violation in hydrogen diselenide isotopomers 1,2,3H280Se2ISRAEL JOURNAL OF CHEMISTRY, Issue 3-4 2003Michael Gottselig We present quantitative calculations of the mode-selective stereomutation tunneling in the chiral hydrogen diselenide isotopomers X2Se2 with X = H, D, and T. The torsional tunneling stereomutation dynamics were investigated with a quasi-adiabatic channel quasi-harmonic reaction path Hamiltonian approach, which treats the torsional motion anharmonically in detail and all remaining coordinates as harmonic (but anharmonically coupled to the reaction coordinate). We also investigated the influence of the excitation of fundamental modes on the stereomutation dynamics and predict which modes should be promoting or inhibiting. Our stereomutation dynamics results and the influence of parity violation on these are discussed in relation to our recent investigations for the analogous molecules H2O2, HSOH, H2S2, and Cl2S2. The electronic potential energy barrier heights for the torsional motion of hydrogen diselenide are similar to those of HSOH, whereas the torsional tunneling splittings are similar to the corresponding values of HSSH. The ground-state torsional tunneling splittings calculated here for D2Se2 are of the same order as the parity-violating energy difference reported by Laerdahl and Schwerdtfeger (Phys. Rev. A 1999, 60, 4439), whereas for T2Se2 the corresponding tunneling splitting is about three orders of magnitude smaller. [source] Understanding High-Resolution Spectra of Nonrigid Molecules Using Group TheoryCHEMPHYSCHEM, Issue 4 2010Melanie Schnell Dr. Abstract Permutation-inversion group theory has developed to become an important tool in the high-resolution spectroscopy of nonrigid molecules. This large class of molecules is very intriguing to study. Small molecules such as ammonia or Na3 are known to be nonrigid. With increasing size, however, several large-amplitude motions are possible in a molecule, and can even interact with each other. The high-resolution spectra of nonrigid molecules are known to be quite complicated and very rich in information. Details about the molecule and its internal dynamics can be extracted, such as the molecular structure, the character of the chemical bonds, and the barrier heights to internal rotation and their dependence on the chemical bonds. However, due to the nonrigidity of the molecule and the complexity of such spectra, their analysis is usually quite challenging. Theoretical methods are needed for their prediction and analysis. This Review concentrates on permutation-inversion group theory and its usefulness for the analysis of high-resolution spectra of nonrigid molecules, which is examined in more detail using different examples. In a separate section, a special aspect of molecular symmetry is discussed: the breakdown of symmetry principles. Special emphasis is placed on the breakdown of space inversion symmetry (parity violation) in chiral molecules and its possible implications in high-resolution spectroscopy. [source] Cross-market efficiency in the Indian derivatives market: A test of put,call parityTHE JOURNAL OF FUTURES MARKETS, Issue 9 2008VipulArticle first published online: 30 JUL 200 This study examines the cross-market efficiency of the Indian options and futures market using model-free tests. The put,call,futures and put,call,index parity conditions are tested for European style Nifty Index options. Thirty-five-month time-stamped transactions data are used to identify mispricing. Frequent violations of both forms of put,call parity are observed. The restriction on short sales largely accounts for the put,call,index parity violations. There are numerous put,call,futures arbitrage profit opportunities even after accounting for transaction costs, which vanish quickly. Put options are overpriced more often than call options. The mispricing shows specific patterns with respect to time of the day, moneyness, volatility, and days to expiry. © 2008 Wiley Periodicals, Inc. Jrl Fut Mark 28:889,910, 2008 [source] | ||||||||||