U. Cross Sections for Excitation by H 2 * by Ele trons: e • H 2 *(v»0) * e • H 2 *(2po t 2p* ) C.2.8 5. Cross Sections for Dissociation of H 2 into Excited Fragments by Electron Impact: e*H 2 *e-»H* H(2p,n«3,n»U) C.2.10

22. Cross S :tiona for Formation of H Atoms in High Excited States by H* Impact on la, 1%, K, and Cm .... A.2.U 23. Excitation Cross Sections for the Reactions V Eg** H 2-H(2«,3s f 2p,3p,3, Hg, and Ha "". A.3-16 9. Dissociation Cross Sections for HD* Ions in He and 3e A.3.18 10. Dissociation Cross Sections for the Production of Past K* and Ho* fro* H 3 * in H 2 A.3.20 11. Dissociation Cross Sections for the Production of H° and H 2° fron H 3 * in H 2 A.3.22 12. Cross Sections for the Formation of Fast H* and H 2 * fron the Dissociation of H3+ in He and Re A.3.2U 13. Cross Sections for the Formation of H* H 2 + , and (H 2° • H°) fro« the Dissociation of H 3 * in Water Vapor A.3.26 Ik. Total and Partial Cross Sections for the Dissociation of HeH* in He A.3.28 1$. Total and Partial Cross Sections for the Dissociation of HeH* in Hg A.3.30 Continuations A.3.33 Electron Capture Cross Sections 1. Electron Capture Cross Sections for H~, H° and H* Passing Through Atonic Hydrogen A.U.2 2. Electron Capture Cross Sections for H* and H° Passing Through H 2 A.».» 3. Elactron Capture Cross Sections for H+ and H° Passing Through Helium A.U.6 U. Electron Capture Cross Sections for H* and H° Passing Through I 2 A.*.8 5. Electron Capture Cross Sections for H* and H° Passing Through 0 and Ofc A.U.10 6. Electron Capture Cross Sections for H* and H° Passing Through He Gas A.«.12 7. I .ectron Capture Cross Sections for H* and H° F using Through Ar A.U.iU <). Electron Capture Cross Sections for H* in H 2 0 and CHjj A.U.16 9. Electron Capture Cross Sections fbr H* in CO and CO2 Charges in H 2 and He by H* A.5. 1 * 3. Cross Sections for Production of Free Electrons in H2 end He by Protons A.5.6 k. Cross Sections for the Production of Slow H 2 and H* frosi H* and H c Impact on Hg A.5-8 5. Cross Sections for Positive Ion Production in M 2 and O2 by H* A.5-10 6. Cross Sections for Zlectron Production in »2 *nd 0 2 by H* A.5-12 T. Cross Sections for Production of n 2 * 9 S*, and H 2 * Ions by Protons in M 2 Gas A.5-1 1 * 8. Cross Sections for Production of O2*, 0* and 0 2 * Ions by Protons in Og A.5.16 9. Angular Distribution of Electrons from 300-keV Proton Impact in H 2 A.5.18 10. Angular Distribution of Electrons of Various Energies froa 300-keV Proton lapacts in H 2 A.5-20 11. Differ...

Secondary negative and positive charge emission coefficients for bombardment of a gas-covered Cu surface by H+, H0, and H− have been measured for projectile energies of ∼25–2500 eV. The secondary negative charge yield for H0 impact was found to be 1.15±0.08 times that for H+ impact. For H− impact, the secondary negative charge yield decreased less rapidly with projectile energy than that of H+ and H0 impact, being about an order of magnitude larger at the lowest energies investigated. The secondary positive charge yields were found to be independent of the projectile charge state and were about an order of magnitude smaller than the negative charge yields. The measurement techniques are described, and the results are compared with the data of other investigators.

Singlet fission (SF) is the process of formation of multiple excitons (triplet) from a locally excited singlet state. The mechanism of SF in polyacenes has been shown to proceed via a charge transfer intermediate state. However, carotenoids are not understood in the context of SF. This is possibly due to the complicated multireference nature of the low-lying excited states of carotenoids and the presence of a dark 2 1 A g state below the optically bright 1 B u state. In this work, we show that the dark A g state in polyenes and/or carotenoids, along with the charge transfer states, plays a pivotal role in the SF process. We notice that the relative importance of these states varies with a change in geometry and the overall presence of multiple pathways is crucial to the success of the SF process in carotenoid aggregates and disordered geometries.

A neutral spectrometer, consisting of a gas conversion cell and electrostatic energy analyser, has been designed, constructed, and calibrated to measure the energy dispersion of energetic H- or D-atoms escaping a plasma. For energies less than 300 to 500 eV the D-atom conversion to D+ was greater than that of H-atom conversion to H+. At a target density of 0.0125 Torr-cm the conversion efficiency of H in N2 gas is 3.8 × 10−4 at 0.165 keV and increases to 3.3 × 10−2 at 10 keV. Results for H2 conversion gas were an order of magnitute less than that of N2 at the lower energies.