FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2384442509> ?p ?o ?g. }

• W2384442509 abstract "and foreign gases. When the molecules of such mixtures are excited by radiation from a CO s laser, a number of complex effects are observed; and no satisfactory and unambiguous interpretation has yet been given. Analysis of these effects may be greatly complicated by thermal processes, which often determine the effective time of photochemical reactions initiated by laser radiation in a confined volume [3--4]. In the work reported here, we investigated changes in absorbed energy, rates of relaxation processes, and intensities of induced absorption from high vibrational levels of the ground electronic state, as related to increases in the pressure of foreign gases in mixtures with polyatomic molecules of different degrees of complexity. The molecules that were investigated were aerolein (CaH40), acetophenone (CallaO), and diacetyl (C4HeOs); in the region of CO~. laser radiation, they have IR absorption bands with Vm~ x = 959,954, and 945 cm -1 and comparatively small absorption cross sections at a frequency of 944 cm -1 (P20) (5.5, 1.5, 1.15).10 -19 cm 2, respectively. The gas mixtures were admitted to a heated cuvette with a length of 40 cm. The absorbing molecules were diluted with a large quantity of He, N s, or Ar. In measuring the absorbed energy in the pressure interval from 0 to 2.0.106 Pa, we used a specially designed high-pressure steel cuvette. The IR radiation pulse had an energy up to 5 J, duration of peak 80 nsec at half-height, and a tail of about 1.5 #see. We used a collimated laser beam with a diameter (1.5 cm) that was smaller than the diameter of the cuvette (4 cm). The changes in cross section of the laser beam through the length of the cuvette were no greater than 30%. The absorbed energy was determined by means of standard calorimeters or pyroelectric sensors. The cuvette length and the vapor pressure were selected so that the vapor would absorb no more than 15% of the laser energy, so that we were able to consider the intensity of IR radiation as identical over the entire length of the cuvette, and the temperature distribution in the laser beam as uniform. The kinetics of change in populations of vibrational levels of the ground electronic state were monitored on the basis of electronic absorption. These observations were performed in the long-wave absorption bands of acrolein (320--390 nm), diacetyl (370--460 nm), and acetophenone (300--360 nm), and also in regions where there is no absorption under ordinary conditions. At various levels of CO s laser energy density Ecos, we determined the dependence of the absorbed energy (average per molecule) on the pressure of foreign gas Peg (Fig. 1). We found that, for these particular polyatomie molecules, the changes in cross section of MVE with increasing Peg are either very small or zero. Oscillograms of induced absorption on the long-wave shoulder of the electronic spectra, in the region where there is little or no original absorption, demonstrate that this absorption increases with increasing pressure of N~. or Ar for all of the molecules that were investigated. In Fig. 2 we show the influence of Pfg on the relative intensities I(t)/Io(t), where I(t) and I0(t) are the intensities at the maxima of the induced absorption pulses in the mixtures and in the pure vapor, respectively. An increase in electronic absorption when vapor with a pressure no higher than l0 s Pa is highly diluted with a foreign gas is observed only with pressures Pfg < 1.10 s Pa. Subsequently, the curves come out to saturation more" @default.
• W2384442509 created "2016-06-24" @default.
• W2384442509 creator A5041048226 @default.
• W2384442509 creator A5065672953 @default.
• W2384442509 date "1990-01-01" @default.
• W2384442509 modified "2023-09-23" @default.
• W2384442509 title "MOLECULES IN MIXTURES WITH FOREIGN GASES" @default.
• W2384442509 cites W2995314351 @default.
• W2384442509 hasPublicationYear "1990" @default.
• W2384442509 type Work @default.
• W2384442509 sameAs 2384442509 @default.
• W2384442509 citedByCount "0" @default.
• W2384442509 crossrefType "journal-article" @default.
• W2384442509 hasAuthorship W2384442509A5041048226 @default.
• W2384442509 hasAuthorship W2384442509A5065672953 @default.
• W2384442509 hasConcept C113196181 @default.
• W2384442509 hasConcept C120665830 @default.
• W2384442509 hasConcept C121332964 @default.
• W2384442509 hasConcept C125287762 @default.
• W2384442509 hasConcept C153385146 @default.
• W2384442509 hasConcept C159985019 @default.
• W2384442509 hasConcept C178790620 @default.
• W2384442509 hasConcept C181500209 @default.
• W2384442509 hasConcept C184779094 @default.
• W2384442509 hasConcept C185592680 @default.
• W2384442509 hasConcept C19184958 @default.
• W2384442509 hasConcept C192562407 @default.
• W2384442509 hasConcept C32909587 @default.
• W2384442509 hasConcept C37160838 @default.
• W2384442509 hasConcept C520434653 @default.
• W2384442509 hasConcept C84662259 @default.
• W2384442509 hasConceptScore W2384442509C113196181 @default.
• W2384442509 hasConceptScore W2384442509C120665830 @default.
• W2384442509 hasConceptScore W2384442509C121332964 @default.
• W2384442509 hasConceptScore W2384442509C125287762 @default.
• W2384442509 hasConceptScore W2384442509C153385146 @default.
• W2384442509 hasConceptScore W2384442509C159985019 @default.
• W2384442509 hasConceptScore W2384442509C178790620 @default.
• W2384442509 hasConceptScore W2384442509C181500209 @default.
• W2384442509 hasConceptScore W2384442509C184779094 @default.
• W2384442509 hasConceptScore W2384442509C185592680 @default.
• W2384442509 hasConceptScore W2384442509C19184958 @default.
• W2384442509 hasConceptScore W2384442509C192562407 @default.
• W2384442509 hasConceptScore W2384442509C32909587 @default.
• W2384442509 hasConceptScore W2384442509C37160838 @default.
• W2384442509 hasConceptScore W2384442509C520434653 @default.
• W2384442509 hasConceptScore W2384442509C84662259 @default.
• W2384442509 hasLocation W23844425091 @default.
• W2384442509 hasOpenAccess W2384442509 @default.
• W2384442509 hasPrimaryLocation W23844425091 @default.
• W2384442509 hasRelatedWork W1662378171 @default.
• W2384442509 hasRelatedWork W1977015177 @default.
• W2384442509 hasRelatedWork W1985053829 @default.
• W2384442509 hasRelatedWork W1993337533 @default.
• W2384442509 hasRelatedWork W1997209199 @default.
• W2384442509 hasRelatedWork W2013294844 @default.
• W2384442509 hasRelatedWork W2014743670 @default.
• W2384442509 hasRelatedWork W2028111538 @default.
• W2384442509 hasRelatedWork W2040697471 @default.
• W2384442509 hasRelatedWork W2043664922 @default.
• W2384442509 hasRelatedWork W2061296257 @default.
• W2384442509 hasRelatedWork W2078622316 @default.
• W2384442509 hasRelatedWork W2083682097 @default.
• W2384442509 hasRelatedWork W2089565324 @default.
• W2384442509 hasRelatedWork W2327577800 @default.
• W2384442509 hasRelatedWork W2363157474 @default.
• W2384442509 hasRelatedWork W2388733741 @default.
• W2384442509 hasRelatedWork W321541224 @default.
• W2384442509 hasRelatedWork W774486681 @default.
• W2384442509 hasRelatedWork W115212566 @default.
• W2384442509 isParatext "false" @default.
• W2384442509 isRetracted "false" @default.
• W2384442509 magId "2384442509" @default.
• W2384442509 workType "article" @default.