| http://www.w3.org/ns/prov#value | - As areducing agent having a work function of 2.9 eV or less, combinations of two or more alkali metals mentioned above are preferable, particularly combinations including Cs, such as Cs and Na, Cs and K, Cs and Rb, or Cs, Na and K are preferable.The combination containing Cs makes it possible to exhibit the reducing ability efficiently.
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