Methods and devices are disclosed for selective photo-destruction of one chiral enantiomer of a compound using nanostructures by enhancing differential absorption of circularly polarized light by the one chiral enantiomer. Methods and devices are disclosed for selective enrichment of one chiral enantiomer of a compound using nanostructures by enhancing differential absorption of circularly polarized light by the one chiral enantiomer. The nanostructures support optical frequency electric resonances and optical frequency magnetic resonances.

Methods and devices are disclosed for selective photo-destruction of one chiral enantiomer of a compound using nanostructures by enhancing differential absorption of circularly polarized light by the one chiral enantiomer. Methods and devices are disclosed for selective enrichment of one chiral enantiomer of a compound using nanostructures by enhancing differential absorption of circularly polarized light by the one chiral enantiomer. The nanostructures support optical frequency electric resonances and optical frequency magnetic resonances.

The invention relates to the use of substances for the production of anions suitable for charge transfer reactions in mass spectrometers, particularly for the fragmentation of multiply positively charged biopolymer ions by electron transfer or for charge reduction by proton transfer. Diketones, particularly -diketones, are proposed as a newly found class of substances which can be used both for the production of radical anions for electron transfer dissociations (ETD) with a high yield of fragment ions and also for the production of non-radical anions for the charge reduction of multiply charged analyte ions by proton transfer reactions (PTR). These substances have favorable properties in terms of their handling and the associated analytical methods: they are largely nontoxic, cover a favorable range of molecular masses, and their volatility means that they can be stored in unheated containers outside of the vacuum system, which facilitates the refilling of the containers.