Bunsen-Roscoe law

Bunsen-Roscoe law Bunte salt Bunte salts Bunte s salt Bunyavirus Buoyancy... 

Multiphoton processes are also undoubtedly involved in the photodegradation of polymers in intense laser fields, eg, using excimer lasers (13). Moreover, multiphoton excitation during pumping can become a significant loss factor in operation of dye lasers (26,27). The photochemically reactive species may or may not be capable of absorption of the individual photons which cooperate to produce multiphoton excitation, but must be capable of utilising a quantum of energy equal to that of the combined photons. Multiphoton excitation thus may be viewed as an exception to the Bunsen-Roscoe law. 

Zimmerman and Briggs explain their dosage response curves on the basis of three independent pigment systems. However, for several reasons it appears more reasonable to ascribe their complicated patterns to different secondary rather than to distinct primary processes. First, the first and second positive curvatures show essentially the same action spectra (Fig. 3 4 and 5). Second, the Bunsen-Roscoe law holds only for the first 100 s of irradiation. After that time factors other than photochemical ones clearly govern phototropism. Third, the dosage response curves are not real kinetics, i.e. they do not represent continuous traces of bending in time, as the authors assume for their calculations. However, curvature was allowed to develop for 100 min in darkness, measured and plotted as a function of dosage. 

Buna process, 22 111 Bundle branches, 5 80 Bundle of His, 5 80 Bundles scrap, 21 409 Bundpacker, 7 691 B nnagel formula, 23 473 Bunsen burners, 7 455—451, 458 Bunsenite, color, 7 331 Bunsen-Roscoe law, 19 108 Bunyaviruses, 3 138 Buoyancy... 

The above statement was referred to as the Draper law or, when the Grotthuss paper was rediscovered, the Grotthuss-Draper law, generally stated in a qualitative, rather than quantitative, way. Notice that the quantitative aspect, indeed quite important in both of the original proposals by the two scientists, was rather referred to as the Bunsen-Roscoe law. This was stated as in two photochemical reactions, if the product of the intensity of illumination and the time of exposure are equal, the quantities of chemical material undergoing change will be equal [17]. ... 

Chapman and MacMahon found that small amounts of O2 inhibited the photosynthesis of HCl from H2 and CI2, in agreement with a much earlier observation by Bunsen and Roscoe . The inhibiting effect of O2 was found by Boden-stein and Dux to make the rate of HCl production inversely proportional to [O2]. These facts were confirmed by Chapman who found that HCl production followed the rate law... 

This reaction was first thoroughly investigated by Bunsen and Roscoe in 1855 (Ostwald s Klassiker, 34 and 38) It had, of course, been the subject of earlier work, the most important conclusion of such work being the statement known as the Grotthus-Draper Absorption Law, vtz only those rays are effective which are absorbed Draper had also made the extremely interesting observation that chlonne which had been exposed to light had somewhat different properties from unexposed chlorine, in that the previously exposed chlonne reacted much more rapidly with... 

Bohuslav Brauner (Prag 8 May 1855-15 February 1935) was the son of a lawyer and leader of the Czech party. His maternal grandfather, K, A. Neumann, was professor of chemistry in the Polytechnic there and a nephew of Caspar Neumann (see Vol. II, p. 702). After study at Prag, Brauner worked at Heidelberg with Bunsen, and then Manchester with Roscoe (1880-2). The inspiration in Brauner s work was the periodic law, with which he became acquainted on reading Mendeleeff s paper in Liebig s Annalen of 1871. In an obituary of Mendeleeff (1907) Brauner said... 

The third law, also known in the literature as the reciprocity law was initially elaborated by Bunsen and Roscoe. 

Bunsen and Roscoe [60] reported the first reciprocity law based experiments, according to which all mechanisms of photochemical processes are exclusively dependent on total absorbed energy and independent of exposure time, t, and radiant intensity, 7, and expressed as ... 

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