摘要:

The thermodynamic properties of the alkaline earth metals in the condensed state have been critically reassessed, and recommended valued for all of the relevant thermodynamic properties are given. These values are compared with those published in recent reviews by the staff at the Institute for High Temperatures (Moscow) and the National Bureau of Standards (Washington, DC), and the reasons for any differences are discussed in detail. A direct result of this review is a set of recommendations for experimental studies which should enhance the reliability of the thermodynamic results. The properties considered are: temperatures and enthalpies of phase transformation and fusion, heat capacities from 0 K to 2000 K, the Debye temperatures, and electronic heat capacity coefficients at absolute zero temperature.

ISSN:0047-2689    

DOI:10.1063/1.555935

出版商:AIP    

年代:1993

数据来源: AIP

摘要:

All significant experimental measurements and many theoretical calculations of the spectroscopy and structure of the isotopic lithium hydrides (6LiH,7LiH,6LiD,7LiD) are identified and reviewed. Published molecular constant determinations from conventional and laser spectroscopy are evaluated; recommended spectroscopic constants for theX 1&Sgr;+,A 1&Sgr;+, andB 1&Pgr; states are tabulated. Potential energy curves (RKR, IPA, and hybrid) for theX 1&Sgr;+,A 1&Sgr;+, andB 1&Pgr; states are evaluated and recommended curves are tabulated. Dissociation energy estimates are evaluated and recommendedD0andDevalues tabulated forX 1&Sgr;+,A 1&Sgr;+, andB1&Pgr; states. Accurate electronic structure calculations (Hartree Fock or better) on this ‘‘workbench of theoretical chemistry’’ are listed and described briefly; all excited electronic states considered are included. Experimental and theoretical radiative and dipole properties are noted and discussed. Adiabatic corrections to the Born–Oppenheimer approximation are also reviewed. Calculations on LiH+and LiH−are also listed and described briefly.

ISSN:0047-2689    

DOI:10.1063/1.555936

出版商:AIP    

年代:1993

数据来源: AIP

摘要:

Quenching of excited singlet and triplet states of many substances by ground state molecular oxygen produces singlet oxygen, the lowest electronically excited singlet state of molecular oxygen, O2(1&Dgr;g). The fractions of singlet and triplet states quenched which produce singlet oxygen and the quantum yields of formation of singlet oxgyen in fluid solutions have been critically compiled. Methods for determination yield parameters have been reviewed. Data have been compiled from the literature through 1991. Photosensitizers such as aromatic hydrocarbons, aromatic ketones and thiones, quinones, coumarins, fluoresceins, transition metal complexes, and heterocyclics are included in Table 1. Porphyrins and phthalocyanines are included in Table 2. Other materials which have been investigated for singlet oxygen production, such as dyes and drugs, are collected in Table 3 along with heterogeneous systems such as polymer‐bound photosensitizers.

ISSN:0047-2689    

DOI:10.1063/1.555934

出版商:AIP    

年代:1993

数据来源: AIP