Core hole-electron correlation in coherently coupled molecules

We study the core hole-electron correlation in coherently coupled molecules by energy dispersive near edge X-ray absorption fine-structure spectroscopy. In a transient phase, which exists during the transition between two bulk arrangements, 1,4,5,8-naphthalene-tetracarboxylicacid-dianhydride multilayer films exhibit peculiar changes of the line shape and energy position of the X-ray absorption signal at the C K-edge with respect to the bulk and gas phase spectra. By a comparison to a theoretical model based on a coupling of transition dipoles, which is established for optical absorption, we demonstrate that the observed spectroscopic differences can be explained by an intermolecular delocalized core hole-electron pair. By applying this model we can furthermore quantify the coherence length of the delocalized core-exciton.Comment: 5 pages, 3 figures, Accepted Version, PRL, minor wording change

Mapping of Forest Soils

The variability of soil profiles causes difficulty in the preparation of a soils map for forestry purposes. The differences from profile to profile are apt to bewilder the beginner unless he understands the reasons for them. A very nice example of this class of soils problem was encountered about a year ago in the subdivision of the Dukes Experimental Forest of the Lake States Forest Experiment Station

A Summer in the Permanent Home of the Pine---or---So That Is Forestry

It was June and twilight gathering over the town of Ames as we lolled about on the depot lawn, in anticipation of three months in the woods of Northern Minnesota and Cass Lake. Now and then one of the fellows would stretch himself, climb over the lawn guardrail and make his way to the station to learn if the eastbound train were on time

Multiple~Use Potentialities of the Farm Woodlot

DURING the past twenty years there has been a growing appreciation of the need for conserving the forest resources of southwestern Wisconsin. As a result, many tracts of woodlands which formerly were given little protection, and no management, now are dedicated to sustained timber production. Actually, the growing of forest crops is only one of the objectives of the present-day program, and other accompanying benefits are sufficiently important to justify the claim that the multiple use of timber lands is an accomplished fact on many farms in this region. Thus, the value of forest cover and associated vegetation in reducing runoff, erosion, and the amount of top soil lost through excessive blowing was recognized from the start. In the decade from 1930 to 1940, thousands of acres of woodlands on farms throughout southern Wisconsin and southern Minnesota were fenced and protected from livestock and fire. · Less frequently the stands were thinned or given other types of silvicultural treatment. The Civilian Conservation Corps and other public works agencies provided impetus for this forestry program

Hadron masses in QCD with one quark flavour

One-flavour QCD - a gauge theory with SU(3) colour gauge group and a fermion in the fundamental representation - is studied by Monte Carlo simulations. The mass spectrum of hadronic bound states is investigated in a volume with extensions of L ~ 4.4r_0 (~2.2fm) at two different lattice spacings: a ~ 0.37r_0 (~0.19fm) and a ~ 0.27r_0 (~0.13fm). The lattice action is Symanzik tree-level-improved Wilson action for the gauge field and (unimproved) Wilson action for the fermion.Comment: 21 pages, 4 figures; further references adde