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51.
The attenuation of second sound (spin-entropy) wave in the superfluid A1 phase has been measured in magnetic fields up to 11 T and to sufficiently high frequency to observe the bulk attenuation proportional to the square of frequency. The measured attenuation coefficient is compared with the existing theories of hydrodynamics and dissipative coefficients. The resulting "excess" attenuation is discussed in terms of the temperature dependent spin diffusion coefficient in the superfluid. 相似文献
52.
The R-matrix method is used to calculate the total photoionization cross-sections from the ground 2s
22p
6
1
S
e and the first three excited 2s
22p
53p
3,1
S
e states of Al IV, for photon energies ranging from the first ionization threshold to just above the second threshold of the
residual ion Al V. The two lowest LS terms of Al V − 2s
22p
5
2
P
0, 2s2p
6
2
S
e, 2s2p
6
2
S
e, represented by sophisticated configuration interaction wavefunctions, are included in the R-matrix calculation. The resulting cross-sections are affected by Rydberg series of resonances converging to the 2s2p
6
2
S
e excited threshold. 相似文献
53.
Noah Neidigh Alyssa Alexander Parker van Emmerik Allison Higgs Logan Plack Charles Clem Daniel Cater Nadzeya Marozkina Benjamin Gaston 《Molecules (Basel, Switzerland)》2022,27(4)
S-nitrosothiols are labile thiol-NO adducts formed in vivo primarily by metalloproteins such as NO synthase, ceruloplasmin, and hemoglobin. Abnormal S-nitrosothiol synthesis and catabolism contribute to many diseases, ranging from asthma to septic shock. Current methods for quantifying S-nitrosothiols in vivo are suboptimal. Samples need to be removed from the body for analysis, and the S-nitrosothiols can be broken down during ex vivo processing. Here, we have developed a noninvasive device to measure mammalian tissue S-nitrosothiols in situ non-invasively using ultraviolet (UV) light, which causes NO release in proportion to the S-nitrosothiol concentration. We validated the assay in vitro; then, we applied it to measure S-nitrosothiols in vivo in rats and in humans. The method was sensitive to 0.5 µM, specific (did not detect other nitrogen oxides), and was reproducible in rats and in humans. This noninvasive approach to S-nitrosothiol measurements may be applicable for use in human diseases. 相似文献
54.
van Dongen PG 《Physical review letters》1989,63(12):1281-1284
55.
56.
57.
Babson J Barish B Becker-Szendy R Bradner H Cady R Clem J Dye ST Gaidos J Gorham P Grieder PK Jaworski M Kitamura T Kropp W Learned JG Matsuno S March R Mitsui K O'Connor D Ohashi Y Okada A Peterson V Price L Reines F Roberts A Roos C Sobel H Stenger VJ Webster M Wilson C 《Physical review D: Particles and fields》1990,42(11):3613-3620
58.
Joseph P. Morrall Clem E. Powell Robert Stranger Marie P. Cifuentes Mark G. Humphrey Graham A. Heath 《Journal of organometallic chemistry》2003,670(1-2):248-255
The complexes trans-[Os(CCPh)Cl(dppe)2] (1), trans-[Os(4-CCC6H4CCPh)Cl(dppe)2] (2), and 1,3,5-{trans-[OsCl(dppe)2(4-CCC6H4CC)]}3C6H3 (3) have been prepared. Cyclic voltammetric studies reveal a quasi-reversible oxidation process for each complex at 0.36–0.39 V (with respect to the ferrocene/ferrocenium couple at 0.56 V), assigned to the OsII/III couple. In situ oxidation of 1–3 using an optically transparent thin-layer electrochemical (OTTLE) cell affords the UV–Vis–NIR spectra of the corresponding cationic complexes 1+–3+; a low-energy band is observed in the near-IR region (11 000–14 000 cm−1) in each case, in contrast to the neutral complexes 1–3 which are optically transparent below 20 000 cm−1. Density functional theory calculations on the model compounds trans-[Os(CCPh)Cl(PH3)4] and trans-[Os(4-CCC6H4CCPh)Cl(PH3)4] have been used to rationalize the observed optical spectra and suggest that the low-energy bands in the spectra of the cationic complexes can be assigned to transitions involving orbitals delocalized over the metal, chloro and alkynyl ligands. These intense bands have potential utility in switching nonlinear optical response, of interest in optical technology. 相似文献
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