I tend to be most interested in low-energy molecular lines: CO, NH3, and H2CO being the main candidates.
Note: Splatalogue has made some recent changes to their returned tables, partly per my recommendations. The code below has been update to reflect these changes.
>>> from astropy import units as u
>>> from astroquery.splatalogue import Splatalogue
>>> S = Splatalogue(energy_max=500,
... energy_type='eu_k',energy_levels=['el4'],
... line_strengths=['ls4'],
... only_NRAO_recommended=True,noHFS=True)
>>> def trimmed_query(*args,**kwargs):
... columns = ('Species','Chemical Name','Resolved QNs','Freq-GHz',
... 'Meas Freq-GHz','Log<sub>10</sub> (A<sub>ij</sub>)',
... 'E_U (K)')
... table = S.query_lines(*args, **kwargs)[columns]
... table.rename_column('Log<sub>10</sub> (A<sub>ij</sub>)','log10(Aij)')
... table.rename_column('E_U (K)','EU_K')
... table.rename_column('Resolved QNs','QNs')
... table.sort('EU_K')
... return table
>>> trimmed_query(1*u.GHz,30*u.GHz,
... chemical_name='(H2.*Formaldehyde)|( HDCO )',
... energy_max=50).pprint()
Species Chemical Name QNs Freq-GHz Meas Freq-GHz log10(Aij) EU_K
------- ------------- ------------- -------- ------------- ---------- --------
HDCO Formaldehyde 1(1,0)-1(1,1) -- 5.34614 -8.31616 11.18287
H2C18O Formaldehyde 1(1,0)-1(1,1) 4.3888 4.3888 -8.22052 15.30187
H213CO Formaldehyde 1(1,0)-1(1,1) -- 4.59309 -8.51332 15.34693
H2CO Formaldehyde 1(1,0)-1(1,1) 4.82966 -- -8.44801 15.39497
HDCO Formaldehyde 2(1,1)-2(1,2) -- 16.03787 -7.36194 17.62746
H2C18O Formaldehyde 2(1,1)-2(1,2) 13.16596 13.16596 -6.86839 22.17455
H213CO Formaldehyde 2(1,1)-2(1,2) -- 13.7788 -7.55919 22.38424
H2CO Formaldehyde 2(1,1)-2(1,2) 14.48848 -- -7.49383 22.61771
H2C18O Formaldehyde 3(1,2)-3(1,3) 26.33012 26.33014 -6.03008 32.48204
H213CO Formaldehyde 3(1,2)-3(1,3) -- 27.55567 -6.95712 32.9381
H2CO Formaldehyde 3(1,2)-3(1,3) -- 28.9748 -6.89179 33.44949
>>> trimmed_query(100*u.GHz,400*u.GHz,
... chemical_name='Carbon Monoxide',
... energy_max=50).pprint()
Species Chemical Name QNs Freq-GHz Meas Freq-GHz log10(Aij) EU_K
------- --------------- ----- --------- ------------- ---------- --------
C18O Carbon Monoxide 1-0 109.78218 109.78218 -7.20058 5.26868
13COv=0 Carbon Monoxide 1-0 110.20135 -- -7.49946 5.2888
C17O Carbon Monoxide J=1-0 112.35928 112.35928 -7.17404 5.39236
COv=0 Carbon Monoxide 1-0 115.2712 115.2712 -7.14236 5.53211
C18O Carbon Monoxide 2-1 219.56036 219.56036 -6.21833 15.80595
13COv=0 Carbon Monoxide 2-1 220.39868 -- -6.51752 15.86618
C17O Carbon Monoxide J=2-1 224.71437 224.71439 -6.19179 16.17703
COv=0 Carbon Monoxide 2-1 230.538 230.538 -6.16011 16.59608
C18O Carbon Monoxide 3-2 329.33055 329.33055 -5.66014 31.6116
13COv=0 Carbon Monoxide 3-2 330.58797 -- -5.95976 31.73179
C17O Carbon Monoxide J=3-2 337.0611 337.06113 -5.6336 32.3538
COv=0 Carbon Monoxide 3-2 345.79599 345.79599 -5.60192 33.19169
>>> trimmed_query(1*u.MHz,2*u.GHz,
... chemical_name=' H2CO .*Formaldehyde',energy_max=75,
... energy_type='eu_k').pprint()
Species Chemical Name QNs Freq-GHz Meas Freq-GHz log10(Aij) EU_K
------- ------------- ------------- -------- ------------- ---------- --------
H2CO Formaldehyde 2(2,0)-2(2,1) -- 0.07114 -13.81846 57.612
H2CO Formaldehyde 3(2,1)-3(2,2) -- 0.35557 -12.02319 68.11082
>>> trimmed_query(20*u.MHz,25*u.GHz,chemical_name=' NH3 ').pprint()
Species Chemical Name QNs Freq-GHz Meas Freq-GHz log10(Aij) EU_K
------- ------------- -------------- -------- ------------- ---------- ---------
NH3v=0 Ammonia 1(1)0a-1(1)0s 23.69447 23.6945 -6.43769 24.40492
NH3v=0 Ammonia 2(2)0a-2(2)0s 23.7226 23.72263 -6.31125 65.5867
NH3v=0 Ammonia 2(1)0a-2(1)0s 23.09885 23.09881 -6.94808 81.5904
NH3v=0 Ammonia 3(3)0a-3(-3)0s 23.87008 23.87013 -6.25203 124.68113
NH3v=0 Ammonia 3(2)0a-3(2)0s 22.83422 22.83418 -6.662 151.33353
NH3v=0 Ammonia 3(1)0a-3(1)0s 22.23456 22.2345 -7.29889 167.29666
NH3v=0 Ammonia 4(4)0a-4(4)0s 24.13935 24.13942 -6.20938 201.67106
NH3v=0 Ammonia 4(3)0a-4(-3)0s 22.68835 22.68831 -6.54002 238.96192
NH3v=0 Ammonia 4(2)0a-4(2)0s 21.70341 21.70336 -6.95001 265.52612
NH3v=0 Ammonia 4(1)0a-4(1)0s 21.13434 21.13431 -7.58659 281.43749
NH3v=0 Ammonia 5(5)0a-5(5)0s 24.53292 24.53299 -6.1706 296.53357
NH3v=0 Ammonia 5(4)0a-5(4)0s 22.65307 22.65302 -6.46829 344.46226
NH3v=0 Ammonia 5(3)0a-5(-3)0s 21.28532 21.28528 -6.79928 381.6003
NH3v=0 Ammonia 5(2)0a-5(2)0s 20.37145 20.37145 -7.20859 408.05568
NH3v=0 Ammonia 5(1)0a-5(1)0s 19.83833 19.83835 -7.84539 423.90259
NH3v=0 Ammonia 6(5)0a-6(5)0s 22.73249 22.73243 -6.41603 467.80451