Generation of light in the near infrared using solutions of asymmetric polymethine dyes

Abstract

We measure planet occurrence rates using the planet candidates discovered by the Q1-Q16 Kepler pipeline search. This study examines planet occurrence rates for the Kepler GK dwarf target sample for planet radii, ⩽ 0.75 R p ⩽ 2.5 Å R , and orbital periods, ⩽ 50 P orb ⩽ 300 days, with an emphasis on a thorough exploration and identification of the most important sources of systematic uncertainties. Integrating over this parameter space, we measure an occurrence rate of F 0 = 0.77 planets per star, with an allowed range of ⩽ ⩽ F 0.3 0 1.9. The allowed range takes into account both statistical and systematic uncertainties, and values of F 0 beyond the allowed range are significantly in disagreement with our analysis. We generally find higher planet occurrence rates and a steeper increase in planet occurrence rates toward small planets than previous studies of the Kepler GK dwarf sample. Through extrapolation, we find that the one year orbital period terrestrial planet occurrence rate z 1.0 = 0.1, with an allowed range of z ⩽ ⩽ 0.01 1.0 2, where z 1.0 is defined as the number of planets per star within 20% of the R p and P orb of Earth. For G dwarf hosts, the z 1.0 parameter space is a subset of the larger h Å parameter space, thus z 1.0 places a lower limit on h Å for G dwarf hosts. From our analysis, we identify the leading sources of systematics impacting Kepler occurrence rate determinations as reliability of the planet candidate sample, planet radii, pipeline completeness, and stellar parameters.

Synthesis, Structure, Spectroscopic Studies, and Complexation of Novel Crown Ether Butadienyl Dyes

“…An increase in the length of the chain of conjugation in polymethine dyes from n 1 to n 2 is known to induce a 20 ± 30 nm bathochromic shift of the long-wavelength absorption maximum and to increase noticeably the fluorescence quantum yield [8]. Indeed, butadienyl dyes exhibit fairly efficient fluorescence and are able to generate laser radiation on pulse excitation [9] [10]. It can be suggested that a combination of the structural fragment of a butadienyl dye and a macroheterocyclic fragment would provide a new promising type of light-sensitive host molecule, which can be used as selective chromo-and fluoroionophores, as elements of photoswitchable molecular devices, and for improving the generation characteristics of laser dyes.…”

Электронное Строение И Спектрально-Флуоресцентные Свойства Лазерных Красителей Тиопирило-4-Трикарбоцианинов

“…Впервые на нем была получена генерация в ближнем ИК диапазоне при накачке длиной волны 1060 nm в полимерной активной лазерной среды [8]. Причем эффективность генерации сравнима с органическими активными средами видимого спектрального диапазона [9,10]. Однако особенности спектральнолюминесцентных свойств красителя 1 (схема) и их связь с его электронным строением практически не исследованы.…”