暗云中发现雷酸HCNO
Discovery of Fulminic Acid, HCNO, in Dark Clouds
摘要：
我们报告的第一次检测在空间的雷酸，HCNO。HNCO的这种异构体已经在三个无星核B1、L1544和L183中观察到，并且在低质量恒星形成区L1527中观察到，测量的HNCO/HCNO丰度比在40-70之间。然而，在TMC-1的氰基多炔峰方向或Orion热芯区域未检测到HCNO。在这些情况下，TMC-1和Orion中推导出的HNCO/HCNO丰度比分别大于350和1000。发现CH_2 + NO \to HCNO + H是雷酸生成的关键反应。Miller等人（2003年）给出的相应反应速率系数值为5.5 × 10^{-12} cm ^3 s^{-1}，可以重现在观测到的暗星云和低质量恒星形成核心中观测到的雷酸丰度，其中确定的HNCO在这些区域相对于分子氢的丰度为1-5 × 10^{-10}。
英文摘要：
We report on the first detection in space of fulminic acid, HCNO. This isomer of HNCO has been observed in three starless cores, B1, L1544 and L183, and in the low mass star forming region L1527 with a measured abundance ratio of HNCO/HCNO between 40-70. However, HCNO was not detected towards the direction of the cyanopolyyne peak of TMC-1 or towards the Orion Hot Core region. The derived HNCO/HCNO abundance ratio in these cases is greater than 350 and 1000 in TMC-1 and Orion, respectively. We find that CH_2 + NO \to HCNO + H is a key reaction for the formation of fulminic acid. A value of 5.5 10^{-12} cm^3 s^{-1} of the corresponding reaction rate coefficient, as given by Miller et al. (2003), allows to reproduce the observed abundances of fulminic acid in both the observed dark clouds and low mass star forming core, where the determined abundance of HNCO in these regions with respect to molecular hydrogen is 1-5 10^{-10}.
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