Toward the limits of complexity of interstellar chemistry: Rotational spectroscopy and astronomical search for n- and i-butanal

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Table 7

Rotational and vibrational partition functions of gauche i-PrCHO.

Temperature (K)	Q_r^(a)	Q_v^(b)
9.38	507.7789	1.0000
18.75	1432.7594	1.0007
37.50	4048.2084	1.0277
75.00	11337.6188	1.2408
150.00	32395.4138	2.5019
225.00	59557.2187	5.8979
300.00	91764.5821	14.1391

Notes. ^(a)Q_r is the rotational contribution to the partition function. We took J = 150 as the maximum value. ^(b)Q_v is the vibrational partition function. The total partition function of the conformer is the following product: Q_r × Q_v.

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