Abstract The construction of a new chirped pulse Fourier transform microwave (CP-FTMW) spectrometer with multiple-antenna detection (MAD) is reported. The instrument design and execution represent a completely new approach to possibly increasing sensitivity in CP-FTMW spectroscopy as it does not involve increased sampling, power, or passes of microwaves with the molecular sample. This is particularly advantageous for experiments where only one sampling point is available. The MAD-CP-FTMW or ”MAD Chirp” is demonstrated on both linear molecule carbonyl sulfide (OCS) and asymmetric-top molecule 1,3-difluorobenzene (DFBZ) with detection points at the broadcast antenna as well as in the quadrature to the traditional receiving antenna. Signal-to-noise comparisons with each sample at each detection point have been made and are reported. Experiments demonstrating the signals detected in these new positions are molecular and not an artifact of a reflection are reported. Although this represents a first step to a possible new approach to addressing CP-FTMW sensitivity, no sensitivity increase based on this method is currently reported.

中文翻译：

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一种多天线检测的啁啾脉冲傅里叶变换微波光谱仪

摘要 报道了一种新型多天线检测（MAD）啁啾脉冲傅里叶变换微波（CP-FTMW）光谱仪的构建。仪器设计和执行代表了一种可能提高 CP-FTMW 光谱灵敏度的全新方法，因为它不涉及增加采样、功率或微波与分子样品的传递。这对于只有一个采样点可用的实验特别有利。MAD-CP-FTMW 或“MAD Chirp”在线性分子羰基硫化物 (OCS) 和不对称顶部分子 1,3-二氟苯 (DFBZ) 上都得到了证明，检测点位于广播天线以及正交于传统的接收天线。已经在每个检测点与每个样品进行了信噪比较并进行了报告。实验证明在这些新位置检测到的信号是分子的，而不是反射的人工制品。尽管这代表了解决 CP-FTMW 灵敏度的可能新方法的第一步，但目前没有报道基于该方法的灵敏度增加。