A hybrid moment equation approach to gas-grain chemical modeling

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Volume 530 (June 2011)

A&A, 530 (2011) A131

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Table 1

Percentage of agreement between the results from MC and those from HME/RE.

	n_H = 2 × 10³ cm^-3			n_H = 2 × 10⁴ cm^-3			n_H = 2 × 10⁵ cm^-3



t	10³ yr	10⁴ yr	10⁵ yr	10³ yr	10⁴ yr	10⁵ yr	10³ yr	10⁴ yr	10⁵ yr

hybrid moment equation
T = 10 K	100, 100	100, 100	100, 100	100, 100	100, 100	97.6, 99.2	99.0, 100	100, 100	100, 100
T = 20 K	100, 100	100, 100	100, 100	97.7, 98.9	98.2, 100	100, 100	100, 100	100, 100	100, 100
T = 30 K	100, 100	100, 100	100, 100	98.8, 100	100, 100	99.2, 100	100, 100	100, 100	100, 100
T = 50 K	100, 100	100, 100	100, 100	100, 100	100, 100	100, 100	100, 100	100, 100	97.9, 100

rate equation
T = 10 K	100, 100	100, 100	94.1, 98.8	100, 100	100, 100	93.7, 98.4	99.0, 100	100, 100	95.8, 99.3
T = 20 K	90.2, 93.4	85.3, 90.7	83.6, 93.2	95.5, 95.5	91.2, 95.6	92.3, 96.2	95.3, 96.2	95.0, 95.8	93.9, 96.6
T = 30 K	96.6, 96.6	95.5, 95.5	95.5, 97.0	94.3, 96.6	98.1, 98.1	96.9, 97.7	94.9, 96.9	92.9, 97.4	40.0, 75.0
T = 50 K	100, 100	100, 100	100, 100	100, 100	100, 100	100, 100	100, 100	100, 100	97.9, 100

Notes. The comparison is only made between those species with populations (from MC or HME/RE) larger than 10. The two numbers in each table entry means the percentage of agreement within a factor of 2 or 10, respectively. The grain radius is taken to be 0.1 μm.

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