Erschienen in:
The Journal of Chemical Physics, 126 (2007) 16
Sprache:
Englisch
DOI:
10.1063/1.2721563
ISSN:
0021-9606;
1089-7690
Entstehung:
Anmerkungen:
Beschreibung:
The authors present new measurements of thermal and electrical properties for two porphyrin derivatives. They determine their sublimation enthalpy from the temperature dependence of the effusive beam intensity. The authors study H2TPP and Fe(TPP)Cl in matter-wave interferometry. Both molecules have nearly equal de Broglie wavelengths but different internal characteristics: only Fe(TPP)Cl exhibits an electric dipole moment of about 2.7D and the authors discuss its influence on the molecular interference pattern. The authors add an external electric force field to the interferometer and use it to measure the scalar polarizability. They compare their experimental values α(H2TPP)=105±4±6Å3 and α(Fe(TPP)Cl)=102±9±6Å3 to ab initio calculations and they discuss the influence of thermal excitations on the polarizability.