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首页> 外文期刊>The Astrophysical journal >PRECISE REST FREQUENCIES FOR AlH AND AlD (X~1Σ~+): A REASSESSMENT OF THE ALUMINUM HYPERFINE STRUCTURE
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PRECISE REST FREQUENCIES FOR AlH AND AlD (X~1Σ~+): A REASSESSMENT OF THE ALUMINUM HYPERFINE STRUCTURE

机译：AlH和AlD（X〜1Σ〜+）的精确静止频率：铝超细结构的重新评估

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摘要

The J = 0 → 1 transition of A1H at 377 GHz and the J = 1 → 2 line of AlD at 393 GHz have been recorded using submillimeter direct absorption methods. The two species were created by the reaction of aluminum vapor and H_2 or D_2 gas in a DC discharge. The~(27)A1 quadrupole hyperfine splittings, which are critical for the astronomical identification of these molecules, were measured for both AlH and AlD. In the case of AlH, the observed hyperfine pattern was not consistent with previous measurements. Values of the hyperfine parameters have thus been revised to be eQq = -48.59 MHz and C_I = 0.306 MHz, which agree very closely with recent ab initio predictions. For AlD, eQq was established to be -48.48 MHz with C_I = 0.156 MHz—the first determination of the hyperfine parameters for the molecule. These measurements should enable viable astronomical searches to be conducted for AlH and AlD, presumably with space-borne platforms. Diatomic hydrides containing a cosmically abundant element such as aluminum are fundamental for interstellar and circumstellar chemistry.
机译：已经使用亚毫米波直接吸收法记录了377 GHz下AlH的J = 0→1跃迁和393 GHz下AlD的J = 1→2线。这两种物质是通过铝蒸气与DC放电中的H_2或D_2气体的反应产生的。对AlH和AlD都测量了〜（27）A1四极超细裂，这对于这些分子的天文鉴定至关重要。在AlH的情况下，观察到的超精细模式与先前的测量结果不一致。因此，超精细参数的值已修改为eQq = -48.59 MHz和C_I = 0.306 MHz，这与最近的从头算起的预测非常吻合。对于AlD，eQq被确定为-48.48 MHz，C_I = 0.156 MHz，这是该分子超精细参数的首次确定。这些测量结果应该能够对AlH和AlD进行可行的天文搜索，大概是在星载平台上进行。含有宇宙丰富元素（例如铝）的双原子氢化物是星际和星际化学的基础。

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