Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 124, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2162165
Keywords
-
Funding
- NCRR NIH HHS [RR01348] Funding Source: Medline
- NIGMS NIH HHS [GM12592] Funding Source: Medline
Ask authors/readers for more resources
By means of heterodyned two-dimensional IR photon echo experiments on liquid formamide and isotopomers the vibrational frequency dynamics of the N-H stretch mode, the C-D mode, and the C = O mode were obtained. In each case the vibrational frequency correlation function is fitted to three exponentials representing ultrafast (few femtoseconds), intermediate (hundreds of femtoseconds), and slow (many picoseconds) correlation times. In the case of N-H there is a significant underdamped contribution to the correlation decay that was not seen in previous experiments and is attributed to hydrogen-bond librational modes. This underdamped motion is not seen in the C-D or C = O correlation functions. The motions probed by the C-D bond are generally faster than those seen by N-H and C = O, indicating that the environment of C-D interchanges more rapidly, consistent with a weaker C-D center dot center dot center dot O = C bond. The correlation decays of N-H and C = O are similar, consistent with both being involved in strong H bonding. (c) 2006 American Institute of Physics.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available