The first steps of interstellar phosphorus chemistry

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Volume 633 (January 2020)

A&A, 633 (2020) A54

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Table 8

Main formation and destruction mechanisms for the species PN, PO, HCP, CP, and PH₃ based on the best-fit chemical model at times: t = 10³, 10⁵, 10⁷ yr.

Species	Time	Reaction type	Reaction	Reaction importance
	(yr)			(%)
PN	10³	Formation	P + CN → PN + C	47
		Formation	N + PH → PN + H	25
		Formation	N + PO → PN + O	17

	10⁵	Formation	N + CP → PN + C	27
		Destruction	H⁺ + PN → PN⁺ + H	−27
		Destruction	He⁺ + PN → P⁺ + N + He	−23
		Formation	N + PH → PN + H	10

	10⁷	Destruction	He⁺ + PN → P⁺ + N + He	−41
		Formation	N + CP → PN + C	38
		Destruction	H⁺ + PN → PN⁺ + H	−8

PO	10³	Formation	HPO⁺ + e⁻→ PO + H	48
		Destruction	C⁺ + PO → PO⁺ + C	−44

	10⁵	Formation	HPO⁺ + e⁻→ PO + H	47
		Destruction	H⁺ + PO → PO⁺ + H	−37
		Destruction	C⁺ + PO → PO⁺ + C	−9

	10⁷	Formation	HPO⁺ + e⁻→ PO + H	36
		Destruction	C⁺ + PO → PO⁺ + C	−26
		Formation	O + PH → PO + H	13

HCP	10³	Formation		55
		Destruction	C⁺ + HCP → CCP⁺ + H	−22
		Destruction	C⁺ + HCP → HCP⁺ + C	−22

	10⁵	Formation		50
		Destruction	H⁺ + HCP → HCP⁺ + H	−39

	10⁷	Formation		50
		Destruction	C⁺ + HCP → CCP⁺ + H	−17
		Destruction	C⁺ + HCP → HCP⁺ + C	−17

CP	10³	Destruction	C⁺ + CP → CP⁺ + C	−45
		Formation		34

	10⁵	Destruction	H⁺ + CP → CP⁺ + H	−38
		Formation		29
		Formation	HCP⁺ + e⁻→ CP + H	18

	10⁷	Formation		35
		Destruction	C⁺ + CP → CP⁺ + C	−32
		Destruction	H⁺ + CP → CP⁺ + H	−9

PH₃	10³	Destruction		−45
		Formation	gH + gPH₂ → PH₃	31
		Formation	gPH₃ → PH₃	23

	10⁵	Formation	gPH₃ → PH₃	49
		Destruction		−26
		Destruction		−20

	10⁷	Formation	gPH₃ → PH₃	49
		Destruction		−36
		Destruction	PH₃ + hν → PH₂ + H	−6

Notes. The last column represents the share of the given reaction in the total formation or destruction rate of the corresponding species.

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