Table 1
Infrared absorption bands of C4H4 ice observed in our experimental conditions.
| Assignment | Kim & Kaiser (2009) 100 K Position (cm−1) | JPL 70 K Position (cm−1) | PIIM 70 K Position (cm−1) | PIIM 70 K Relative intensity |
|---|---|---|---|---|
| vl | 3288 | 3291/3284 | 3290/3281 | 100 |
| v3 | 3049 | 3037 | 1.5 | |
| v4 | 3014 | 3017 | 2.1 | |
| v6 + v7 | 2965 | 0.5 | ||
| v5 | 2103 | 2104 | 2.0 | |
| v6 | 1599 | 1592 | 0.9 | |
| vl0 + v12 | 1374 | 1384 | 10.3 | |
| 2v11/2v17/ v11 + v17 | 1259 | 1262 | 15.9 |
Notes. The position of the absorption bands observed after irradiation in the JPL and PIIM experiments at 70 K is shown. The position of the IR absorption bands of crystalline C4H4 ice at 100 K determined experimentally by Kim & Kaiser (2009) is also shown for reference. Relative intensities of the IR bands observed in the PIIM experiment were calculated from the integrated areas of the IR bands.
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