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- W2019766734 abstract "The spectrum of boron hydride, as excited in the cathode of a Schuler lamp, consists of at least three systems, $^{1}ensuremath{Pi}ensuremath{rightarrow}^{1}ensuremath{Sigma}$ of BH, $^{3}ensuremath{Sigma}ensuremath{rightarrow}^{3}ensuremath{Pi}$ of BH, and a new system, $^{2}ensuremath{Pi}ensuremath{rightarrow}^{2}ensuremath{Sigma}$, due to B${mathrm{H}}^{+}$.BH, $^{1}ensuremath{Pi}ensuremath{rightarrow}^{1}ensuremath{Sigma}$.---This system has been extended to include the (2,2) band. One is thereby enabled to refine the rotational and vibrational constants of the system and, from a study of dissociation by rotation, to fix the heat of dissociation (${D}_{e}$) of the normal state at 3.60ifmmodepmelsetextpmfi{}0.05 ev.BH, $^{3}ensuremath{Sigma}ensuremath{rightarrow}^{3}ensuremath{Pi}$, (0,0) head at $ensuremath{lambda}3694$.---The fine multiplet structure of this system has been resolved and the transition, previously reported to be $^{3}ensuremath{Pi}ensuremath{rightarrow}^{3}ensuremath{Sigma}$, established as $^{3}ensuremath{Sigma}ensuremath{rightarrow}^{3}ensuremath{Pi}$. The $^{3}mathrm{II}$ state is regular and near case $b$ ($frac{A}{B}=+0.47$).B${mathrm{H}}^{+}$, $^{2}ensuremath{Pi}ensuremath{rightarrow}^{2}ensuremath{Sigma}$, (0,0) head at $ensuremath{lambda}3766$.---This system is the analog of the green bands of the isoelectronic molecule BeH. Application of the Hill and Van Vleck theory to the $^{2}mathrm{II}$ state does not yield an $frac{A}{B}$ which is constant with increasing $J$. Refinement of the theory to include the rotational $D$ term, along the lines suggested by Gilbert for $^{3}mathrm{II}$ states, does not greatly improve the situation. The remaining discrepancy is probably due to unobservable $^{2}ensuremath{Sigma}$ doubling. The $ensuremath{Lambda}$ type doubling has been evaluated and compared with theory with results very like those in BeH" @default.
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- W2019766734 date "1937-03-15" @default.
- W2019766734 modified "2023-10-14" @default.
- W2019766734 title "The Spectra of Neutral and Ionized Boron Hydride" @default.
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- W2019766734 doi "https://doi.org/10.1103/physrev.51.491" @default.
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