Simple search of mass spectral databases

This form enables you to search for You may combine these features as well.

Activate search for :

Mass or mass range
To restrict search to one mass number, enter the same value in both fields.

Lower mass limit
Upper mass limit

Name fragment
Enter one name fragment, e.g. peroxide

Allowed elements
Select if the elements selected below are the only elements allowed or if there other alowed elements in the compound.

Enter names of up to 10 elements :