Volume 15, Issue 1, January 1986
Index of content:
15(1986); http://dx.doi.org/10.1063/1.555770View Description Hide Description
We present a compilation of spectral parameters associated with triplet–triplet absorption of organic molecules in condensed media. The wavelengths of maximum absorbance and the corresponding extinction coefficients, where known, have been critically evaluated. Other data, for example, lifetimes, energies and energy transfer rates, relevant to the triplet states of these molecules are included by way of comments but have not been subjected to a similar scrutiny. Work in the gas phase has been omitted, as have theoretical studies. We provide an introduction to triplet state processes in solution and solids, developing the conceptual background and offering an historical perspective on the detection and measurement of triplet state absorption. Techniques employed to populate the triplet state are reviewed and the various approaches to the estimation of the extinction coefficient of triplet–triplet absorption are critically discussed. A statistical analysis of the available data is presented and recommendations for a hierarchical choice of extinction coefficients are made. Data collection is expected to be complete through the end of 1984. Compound name, molecular formula and author indexes are appended.
Recommended Rest Frequencies for Observed Interstellar Molecular Microwave Transitions—1985 Revision15(1986); http://dx.doi.org/10.1063/1.555771View Description Hide Description
Accurate transition frequencies for the transitions of the molecular species detected in interstellar clouds are presented. These are recommended for reference in future astronomical observations in the radio and microwave regions. The transition frequencies have been selected through critical examination and analysis of the spectroscopic data in the literature. The species identity, quantum number labels, and probable error limits (2σ) are presented for each transition. Representative line antenna temperatures are also given for a typical source as a convenience to users. References are cited to both the astronomical and laboratory literature.
15(1986); http://dx.doi.org/10.1063/1.555772View Description Hide Description
The General Assembly of the International Association for the Properties of Steam (IAPS), meeting at the 10th International Conference on the Properties of Steam in Moscow in September 1984, adopted new formulations for the thermodynamic properties of fluid H2O and D2O. The new formulations have been designated as the I A P S F o r m u l a t i o n 1 9 8 4 f o r t h e T h e r m o d y n a m i c P r o p e r t i e s o f O r d i n a r y W a t e r S u b s t a n c e f o r S c i e n t i f i c a n d G e n e r a l U s e and the I A P S F o r m u l a t i o n 1 9 8 4 f o r t h e T h e r m o d y n a m i c P r o p e r t i e s o f H e a v y W a t e r S u b s t a n c e. In this paper we present and discuss these new formulations.
Forbidden Lines in n s 2 n p k Ground Configurations and n s n p Excited Configurations of Beryllium through Molybdenum Atoms and Ions15(1986); http://dx.doi.org/10.1063/1.555775View Description Hide Description
Observed and predicted wavelengths of magnetic dipole lines arising within ground configurations of the type n s 2 n p k (n=2 and 3, k=1 to 5) are compiled. For n=2 the compilation includes the elements B through Kr, and for k=5 it extends to Mo. For n=3 Al through Mo are included. In addition the 2s2p excited configuration of the Be i isoelectronic sequence for Be through Kr and 3s3p of the Mg sequence for Mg through Mo are included. For each line we give a calculated value for the transition probability obtained mainly from the Dirac‐Fock method or from the use of scaled radial integrals. The calculated wavelengths are obtained from known energy levels or from levels derived from scaled radial integrals. A small group of electric quadrupole lines seen in astronomical sources are included. The list contains 1660 predicted wavelengths in the range 100 Å to 25.9 mm and 406 observed wavelengths in the range 325 Å to 609 μm.