|Budget Amount *help
¥2,300,000 (Direct Cost : ¥2,300,000)
Fiscal Year 1997 : ¥500,000 (Direct Cost : ¥500,000)
Fiscal Year 1996 : ¥1,800,000 (Direct Cost : ¥1,800,000)
We explained good comparison with the spectrum of quenched carbonaceous composite (QCC) and the observed spectrum which regarded as a chracteistic of interstellar dust in wide spectroscopic region the extended from ultraviolet to infrared. When the measured temperature changes, a lot of organic material causes a change in shape of a spectrum and causes a shift of spectrum position. This study was done with a purpose to know how the spectrum of QCC changed for temperature change.
QCC is a quenched product, or condensate, formed from a hydrocarbon plasma. We collectd the QCC on a quartz substrate inside a vacuum chamber and measured its emission spectrum at room temperature, 77K and 1.5K.The fluorescence spectrum of filmy-QCC showed only a single broad feature. The peak wavelength and intensity of aspectrum hardly changed by temperature, but the band width (hwhm) did decrease4-6nm at low temperature. This low temperature spectrum showed good agreement with that of the extended red emissio
n (ERE) observed in reflection nebulae. On the other hand the fluorescence spectrum from the different place of a substrate, far from injecting nozzle, showed the peak wavelength shifted to the short wavelength side and showed a few small humps. This spectrum showed agreement with the broad background ERE band spctrum of Red Rectangle. We suggested that a material similar in nature to that of the filmy-QCC may be a major component of interstellar dust.
In a further experiment we want to measure the fluorescence spectrum and its quantum efficiency when the QCC excited by various wavelength of ultraviolet rays. From such experiment, important inforamation will be provided about a wavelength of ultraviolet rays effective for ERE,amount of ultraviolet rays, dust density, distribution of dust, and so on.
KBr基板上に生成したfilmy-QCCも場所を選んで赤外スペクトルを測定した。赤外吸収の3.3,3.4,6.2,7.7,8.6及び11.3μmバンドは未同定赤外(UIR)輻射バンドと一致する。蛍光スペクトルに対応して、赤外吸収では基板の場所により吸収線の強度分布が変化している。反射星雲及びRed RectangleでもUIR輻射バンドが観測されている。filmy-QCCはERE及びUIR輻射バンドを示す塵の重要な候補物質である。 Less