Solute effects on the production and decay of primary species in the flash photolysis of indole

Maximum production rates ofs and decay kinetics for the hydrated electron, the indolyl neutral radical and the indole triplet state have been obtained in the microsecond, broadband (X > 260 nm) flash photolysis of helium-saturated, neutral aqueous solutions of indole, in the absence and in the presence of the solutes NaBr, BaCl2*2H20 and CdSCV Fluorescence spectra and fluorescence lifetimes have also been obtained in the absence and in the presence of the above solutes, The hydrated electron is produced monophotonically and biphotonically at an apparent maximum rate which is increased by BaCl2*2H20 and decreased by NaBr and CdSOif. The neutral indolyl radical may be produced monophotonically and biphotonically or strictly monophotonically at an apparent maximum rate which is increased by NaBr and CdSO^ and is unaffected by BaCl2*2H20. The indole triplet state is produced monophotonically at a maximum rate which is increased by all solutes. The hydrated electron decays by pseudo first order processes, the neutral indolyl radical decays by second order recombination and the indole triplet state decays by combined first and second order processes. Hydrated electrons are shown to react with H , H2O, indole, Na and Cd"*""1"". No evidence has been found for the reaction of hydrated electrons with Ba . The specific rate of second order neutral indolyl radical recombination is unaffected by NaBr and BaCl2*2H20, and is increased by CdSO^. Specific rates for both first and second order triplet state decay processes are increased by all solutes. While NaBr greatly reduced the fluorescence lifetime and emission band intensity, BaCl2*2H20 and CdSO^ had no effect on these parameters. It is suggested that in solute-free solutions and in those containing BaCl2*2H20 and CdSO^, direct excitation occurs to CTTS states as well as to first excited singlet states. It is further suggested that in solutions containing NaBr, direct excitation to first excited singlet states predominates. This difference serves to explain increased indole triplet state production (by ISC from CTTS states) and unchanged fluorescence lifetimes and emission band intensities in the presence of BaCl2*2H20 and CdSOt^., and increased indole triplet state production (by ISC from S^ states) and decreased fluorescence lifetime and emission band intensity in the presence of NaBr. Evidence is presented for (a) very rapid (tx ^ 1 us) processes involving reactions of the hydrated electron with Na and Cd which compete with the reformation of indole by hydrated electron-indole radical cation recombination, and (b) first and second order indole triplet decay processes involving the conversion of first excited triplet states to vibrationally excited ground singlet states.

The citizen soldiers at North Point and Port McHenry, September 12 & 13, 1814. Resolves of the citizens in town meeting, particulars relating to the battle, official correspondence and honorable discharge of the troops. Also, celebration of the seventy-fifth anniversary, 1889. Reprint. --

First edition printed by Nathaniel Hickman.

Crystal growth, characterization and point contact spectroscopy on CuxTiSe₂

Various s e t s of single c rys t a l s and poly c rys t a l s of Cux TiSe2 were grown. X- r ay diffraction and ene rgy dispersive spe c t ros copy r e sul t s verified tha t the c rys t a l s were the cor r e c t compos i t ion and c rys t a l s t ruc tur e . Re s i s t ivi ty me a sur ement s and magne t i c sus c ept ibi l i ty me a sur ement s de t e rmined the supe r conduc t ing t r ans i t ion t empe r a tur e s for the c rys t a l s . The c rys t a l s in each growth had various supe r conduc t ing t r ans i t ion t empe r a tur e s . Also, the me a sur ement s indi c a t ed tha t the c rys t a l s were inhomogeneous. Point cont a c t spe c t ros copy expe r iment s were employed on various single c rys t a l s . Inspe c t ion of the da t a indi c a t ed tha t the ma t e r i a l ha s a single ene rgy gap . A progr am was bui l t ut i l i z ing the Levenbe rg-Ma rqua rdt me thod and theory on point cont a c t spe c t ros copy to de t e rmine the supe r conduc t ing ene rgy gap. Plot s of the supe r conduc t ing ene rgy gap a t various t empe r a tur e s were in di s agr e ement wi th wha t was expe c t ed for a convent iona l supe r conduc tor .

Glacial stratigraphy and micromorphology of the Pine Point Pb-­‐Zn mining district, Northwest Territories

This investigation aims to gain a better understanding of the glacial history of the Pine Point Mining district, Northwest Territories, by examining the sedimentological properties of the glacial sediments including, geochemical analysis, heavy mineral concentrate analysis, clast macro-­‐fabrics, pebble lithologies, and micromorphological investigation. Four till units were identified, and three were associated with identified erosional bedrock features and streamlined landforms in the area, indicating a minimum of three ice flow directions. Sedimentological properties suggest that these units were all Type-­B tectomict/mélange till, emplaced as part of a soft subglacial deformable bed. The lack of ice-­‐marginal advance and retreat sequences within the studied till, suggests the Middle Wisconsinan Laurentide Ice margin was likely north and west of the Pine Point area, as opposed to along the margin of the Canadian Shield and Western Sedimentary Basin where it has been suggested to have existed.

The Long Point Company Yearbook 1966

This book marks the one hundredth anniversary of the formation of the Long Point Company. There are penciled initials R.A.L. [Robert A. Laidlaw], Jan. 12th, 1967 within the front cover. See the full text of this item in the Brock University Special Collections and Archives.

Prospect Point, Niagara, U.S.A.

The description of the image reads "(3) Looking down over the high preciptous Bluff at Prospect Point, Niagara, U.S.A."

Prospect Point Crowd, Niagara, U.S.A.

The description of the image reads "(2) Admiring Tourists viewing the Falls, from Prospect Point, Niagara, U.S.A."

Prospect Point, Niagara Falls

The description on the image reads "Free Niagara, Prospect Point, Niagara Falls".

Niagara Falls from Prospect Point to Horseshoe Falls

The description of the image reads "Magnificent outlook over Niagara, world's grandest waterfall, from Prospect Point to Horseshoe Falls". The side of the card is also stamped "By Royal Command to Their Imperial Majesties King George V and Queen Mary".

Niagara Falls from Prospect Point

The description of the image is written in German and mentions Prospect Point and the American Falls. There is also a number listed, V23281.

Prospect Point-Niagara

The description of the image reads "Prospect Point-Niagara".

Sketch of the bridge over Hurst’s Point and calculations about the bridge over the pond at Allenburgh

Sketch of the bridge over Hurst’s Point and calculations about the bridge over the pond at Allenburgh, n.d.

Notice from the Crown Lands Department of Ottawa that the lands on Long Point, Lake Erie would be offered at public auction on May 4, 1866

Notice from the Crown Lands Department of Ottawa that the lands on Long Point, Lake Erie would be offered at public auction on May 4, 1866. This is attached to a small newspaper clipping with the same information, dated April 20, 1866.

Newspaper clipping stating the Long Point Company purchased the island of Long Point in Lake Erie

Newspaper clipping stating the Long Point Company purchased the island of Long Point in Lake Erie. The directors are named in the clipping and it is noted that this is a place for real sportsmen only, n.d.

Act to incorporate the Long Point Company

Act to incorporate the Long Point Company. This is a 4 page document, printed on vellum. It was printed by Malcolm Cameron, Law Printer to the Queen, Aug. 15, 1866.