Table 7
Upper limits for the column density of non-detected silicon-bearing molecules in Orion KL.
| Molecule | Column density | Dipole | References |
| ≲ N × 1014 (cm-2) | moment (D) | spectroscopic constants | |
|
|
|||
| SiC | 1.3 | 1.6001 | (2) |
| SiC2 | 0.35 | 2.3933 | (4) |
| c-SiC3 | 0.13 | 4.2005 | (6) |
| SiC4 | 0.04 | 6.4207 | (8) |
| SiN | 0.61 | 2.5609 | (10) |
| SiCN | 0.31 | 2.90011 | (12) |
| SiNC | 0.31 | 2.00011 | (12) |
| ob-SiC3 | 0.16 | 2.2005 | (13) |
| l-SiC3 | 0.04 | 4.80014 | (14) |
| Si3 | 4 | 0.35015 | (16) |
| SiCCO | 0.40 | 1.93717 | (18) |
| SiCCS | 0.65 | 1.48819 | (19) |
| o-SiH2 | 13 | 0.07520 | (21) |
| o-H2CSi | 1.7 | 0.30022 | (22) |
| p-H2CSi | 1.4 | 0.30022 | (22) |
| mb-Si2H2 | 0.34 | μa = 0.962/μb = 0.03923 | (24) |
| o-db-Si2H2 | 2.5 | μc = 0.48025 | (25) |
References. (1) Langhoff & Bauschlicher (1990); (2) Cernicharo et al. (1989) and Bogey et al. (1990); (3) Suenram et al. (1989); (4) Gottlieb et al. (1989) and Suenram et al. (1989); (5) Alberts et al. (1990); (6) Apponi et al. (1999b); (7) Gordon et al. (2000); (8) Ohishi et al. (1989) and Gordon et al. (2000); (9) Kerkines & Mavridis (2005); (10) Saito et al. (1983) and Bizzocchi et al. (2006); (11) Apponi et al. (2000); (12) Apponi et al. (2000) and McCarthy et al. (2001); (13) McCarthy et al. (1999); (14) McCarthy et al. (2000); (15) Vasiliev et al. (1997); (16) McCarthy & Thaddeus (2003a); (17) Botschwina (2005); (18) Sanz et al. (2005); (19) Botschwina et al. (2002); (20) Gabriel (1993); (21) Hirota & Ishikawa (1999); (22) Izuha et al. (1996); (23) Grev & Schaefer III (1992); (24) Cordonnier et al. (1992) and McCarthy & Thaddeus (2003b); (25) Bogey et al. (1994).
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