708 resultados para BAH


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BaH (and its isotopomers) is an attractive molecular candidate for laser cooling to ultracold temperatures and a potential precursor for the production of ultracold gases of hydrogen and deuterium. The theoretical challenge is to simulate the laser cooling cycle as reliably as possible and this paper addresses the generation of a highly accurate ab initio $^{2}\Sigma^+$ potential for such studies. The performance of various basis sets within the multi-reference configuration-interaction (MRCI) approximation with the Davidson correction (MRCI+Q)is tested and taken to the Complete Basis Set (CBS) limit. It is shown that the calculated molecular constants using a 46 electron Effective Core-Potential (ECP) and even-tempered augmented polarized core-valence basis sets (aug-pCV$n$Z-PP, n= 4 and 5) but only including three active electrons in the MRCI calculation are in excellent agreement with the available experimental values. The predicted dissociation energy De for the X$^2\Sigma^+$ state (extrapolated to the CBS limit) is 16895.12 cm$^{-1}$ (2.094 eV), which agrees within 0.1$\%$ of a revised experimental value of <16910.6 cm$^{-1}$, while the calculated re is within 0.03 pm of the experimental result.

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Title from caption.

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Copy completed on 8 Rajab 918 [September 19, 1512] in the hand of Muḥammad Abū al-Saʻūd al-Jamāl al-Anṣārī.

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1. Risālah fī al-khulūw wa-wujūhihi ʻinda al-Miṣrīyīn wa-al-Maghāribah / li-Ismāʻīl al-Tamīmī -- 2. Suʼāl wa-fatāwá ʻanh / li-Ibrāhīm al-Riyāḥī -- 3. Asʼilah wa-ajwibah fī masāʼil al-kardār / li-Aḥmad ibn al-Khūjah -- 4. Faṣl fī ʻĀrīyat al-khulūw wa-faṣl fī al-inzālāt min Manẓūmat Laqṭ al-durar / li-Muḥammad al-Sanūsī -- 5. Jumlat Taqārīr wa-fatāwá fī al-khalawāt wa-al-inzālāt / li-Muḥammad Bayram wa-al-Shādhilī ibn Ṣāliḥ -- 6. Risālah fī Taḥqīq masʼalat al-khulūw ʻinda al-Mālikīyah / li-Aḥmad al-Fayyūmī al-Farqāwī al-Miṣrī -- 7. Risālah fī al-Kalām ʻalá bayʻ al-waqf idhā khariba wa-mā li-ahl al-madhhab min al-kalām fī dhālik / li-Yaḥyá ibn Muḥammad al-Ḥaṭṭāb.

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Urdu translation of his al-Qawāʻid al-marʻīyah fī uṣūl al-ṭarīqah al-Rifāʻīyah by Muḥammad Kamāl al-Dīn al-Rifāʻī.

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Mode of access: Internet.