The chemistry of ions in the Orion Bar I. – CH+, SH+, and CF+ - The effect of high electron density and vibrationally excited H2 in a warm PDR surface

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Fig. 2

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Top panel: line profiles of CH⁺ 2−1 and 1−0 transitions corresponding to the average of H- and V-polarizations observed with Herschel/HIFI toward the CO⁺ peak in the Orion Bar. Bottom panel: line profiles of C⁺ and CO 16–15, for comparison, observed with Herschel/HIFI toward the CO⁺ peak in the Orion Bar.

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