氘代和15 N乙基氰化物：CH3CHDCN和CH2DCH2CN以及CH3CH2C15N的旋转光谱
Rotational spectrum of deuterated and 15N ethyl cyanides: CH3CHDCN and CH2DCH2CN and of CH3CH2C15N
摘要：
在热分子云中，乙基氰是一种含量丰富的分子。在猎户座中鉴定了来自13 C同位素取代的乙基氰的线。为了在星际天体中寻找和探测其他的乙腈同位素，我们研究了氘代乙腈CH_2DCH_2CN（面内和面外）和CH_3CHDCN的转动光谱以及15 N取代的乙腈CH_3CH_2C_15N的光谱。使用波导傅里叶变换光谱仪（8 - 17 GHz）和采用返波振荡器（BWO）的源调制光谱仪（150 - 260和580 - 660 GHz）在微波和毫米-亚毫米波长范围内测量了每个物质在基态的旋转光谱。从拟合过程中，准确的光谱常数，推导出每个物种。这些新的光谱常数使我们能够可靠地预测旋转光谱（线的频率和强度）在4-1000 GHz的频率范围内，J和Ka分别高达80和31。结合猎户座的IRAM 30 m天线观测，这项实验研究使我们能够在猎户座中首次检测到15 N取代的乙基氰。计算得到的柱密度和转动温度在平台区为10^13 cm-2和150 K，在热核区为310^14 cm-2和300 K。搜寻了氘代物质，但未发现。每种氘代同位素体的柱密度上限为10^14 cm-2。
英文摘要：
Ethyl cyanide is an abundant molecule in hot molecular clouds. Lines from 13C isotopically substituted ethyl cyanide were identified in Orion. To enable the search and the possible detection of other isotopologues of ethyl cyanide in interstellar objects, we have studied the rotational spectrum of deuterated ethyl cyanide: CH2DCH2CN (in-plane and out-of-plane) and CH3CHDCN and the spectrum of15N substituted ethyl cyanide CH3CH2C15N. The rotational spectrum of each species in the ground state was measured in the microwave and millimeter-submillimeter wavelength range using a waveguide Fourier transform spectrometer (8 - 17 GHz) and a source-modulated spectrometer employing backward-wave oscillators (BWOs) (150 - 260 and 580 - 660 GHz). From the fitting procedure, accurate spectroscopic constants were derived for each of the species. These new sets of spectroscopic constants enable us to predict reliably the rotational spectrum (lines frequencies and intensities) in the 4-1000 GHz frequency range and for J and Ka up to 80 and 31, respectively. Combined with IRAM 30 m antenna observations of Orion, this experimental study allowed us to detect 15N substituted ethyl cyanide for the first time in Orion. The derived column density and rotational temperature are 10^13 cm-2 and 150 K for the plateau and 3 10^14 cm-2 and 300 K for the hot core. The deuterated species were searched for but were not detected. The upper limit to the column density of each deuterated isotopologues was 10^14 cm-2.
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