| RefNo | EC/1993/24 |
| Level | Item |
| Title | Leach, Sydney: certificate of election to the Royal Society |
| Date | 1991 |
| Description | Citation typed |
| Citation | Sydney Leach has made many contributions to the study of transient molecules and molecular ions, both small and large. Using novel spectroscopic emission sources he discovered spectra of SH+, H2S+, OCS+, and other molecular ions, and he has recently made pioneer studies of di-cations such as SO2^2+, CH4^2+, CO2^2+ and C10H8^2+. Major contributions have been made to the analysis of many spectra, such as those of CO2^+, C6H6^+ and sym-C6H3F3^+, and on the following dynamical effects: spin-orbit calculations and the Renner-Teller effect in linear species; linear and quadratic Jahn-Teller effects in aromatic ions; matrix-induced effects on the photophysics of benzenoid species; and fluorescence and dissociation kinetics, leading to an understanding of radiationless transitions. He has applied this knowledge to astrophysical problems, such as ionospheric data for Mars and laboratory tests of the possible role of polycyclic aromatic ions in the interstellar medium. |
| AccessStatus | Closed |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA4201 | Leach; Sydney (1924 - 2019) | 1924 - 2019 |