Johnson Fred M
Cal State University Fullerton, Department of Physics, Fullerton, CA 92834, USA.
Spectrochim Acta A Mol Biomol Spectrosc. 2006 Dec;65(5):1154-79. doi: 10.1016/j.saa.2006.03.004. Epub 2006 Mar 7.
As a result of the search for the identity of the chromophores responsible for producing the diffuse interstellar bands, a comprehensive exposition of experimental data is presented, which implicates the following molecules: (1) The extremely stable organic molecules, magnesium tetrabenzoporphyrin (MgTBP) and H(2)TBP. (2) A paraffin matrix (referred to as "grains") containing TBPs. (3) A low concentration of pyridine (also within the grains), whose transmission window at 2175 A, accounts for the ubiquitous UV bump. The blue emission spectra associated with the central star, HD44179, of the Red Rectangle displays the fluorescence excitation spectra of bare MgTBP. This unique spectrum matches the low temperature lab data of MgTBP in the vapor phase. An effective grain temperature of 2.728 K (+/-0.008) was deduced, based on MgTBP's lowest measured vibrational state of 341 GHz.
在探寻产生弥漫星际谱带的发色团身份的过程中，本文给出了一份全面的实验数据阐述，其中涉及以下分子：(1) 极其稳定的有机分子，四苯并卟啉镁（MgTBP）和H₂TBP。(2) 含有四苯并卟啉的石蜡基质（称为“颗粒”）。(3) 低浓度的吡啶（同样在颗粒内），其在2175埃处的透射窗口解释了普遍存在的紫外凸起。与红矩形星云中心恒星HD44179相关的蓝色发射光谱显示了裸MgTBP的荧光激发光谱。这一独特光谱与气相中MgTBP的低温实验室数据相匹配。基于MgTBP最低测量振动状态为341吉赫兹，推导出有效颗粒温度为2.728 K（±0.008）。
