My research involves the connection of molecular structure and dymanics to the observed microwave spectrum of molecules in the gas phase. Currently I cam working with three groups: the Kukolich group at the University of Arizona, the Molecular Spectroscopy Group at the Jet Propulsion Laboratory and Grupo Espectrocopia Molecular in Valladolid, Spain.
Why gas phase?
The gas phase offers a powerful, isolated view of the molecular system to study structure and dynamics. In the case of molecules in the interstellar medium, these conditions ideally replicate the native environments and we can record frequencies in the laborartories that astronomers can detect.
Microwave spectroscopy offers one of the highest resolutions possible in gas phase spectroscopy. The technique is ideally suited for the detection and analysis of isotopic substitution, excited vibrational states, nuclear spin-electron distribution interactions and dipole moment determination. Each microwave spectrum acts like a molecular fingerprint and can uniquely identify molecules in rather cluttered spectral environments due to the high resolution and specific relationships to the structure of the molecule.
Time domain signal (pink) and Frequency domain signal (blue) give accurate data to construct the gas phase structure and electronic environment. This spectrum is the gas phase dimer of Formic Acid - Formamide.
How do we do it?
Microwave spectroscopy can be run in two modes: emission or absorption. Each type of experiment has specialized equipment that relates a detected frequency with an energy level of the molecule.
Figures: (Left) Direct absorption rotational spectroscopy and (Right) Pulsed Beam Microwave Fourier Transform Spectroscopy
Currently, interesting molecular stuctures of B-N complexes and organometallic dimers are being investigated that probe our ability to accurately characterize the gas phase structures such as
Our group is actively recruting interested undergraduates/graduates to engage in research in the areas of Molecular Structure, Instrument Development, Inorganic Synethesis. Please contact me at firstname.lastname@example.org for more details.
Microwave spectra, molecular structure, and aromatic character of 4a, 8a-azaboranaphthalene
AM Pejlovas, AM Daly, AJ Ashe III, SG Kukolich
The Journal of chemical physics 144 (11), 114303 (2016)
VizieR Online Data Catalog: CH3CH2SH detection in Orion KL (Kole
L Kolesnikova, B Tercero, J Cernicharo, JL Alonso, AM Daly, BP Gordon, ...
VizieR Online Data Catalog 178 (2016)
Rotational spectra and nitrogen nuclear quadrupole coupling for the cyanoacetylene dimer: HCCCN⋯ HCCCN
L Kang, P Davis, I Dorell, K Li, A Daly, SE Novick, SG Kukolich
Journal of Molecular Spectroscopy 321, 5-12 (2016)
Analysis of n17 monodeuterated ethane, CH3CH2D from 770 cm-1 to 880 cm-1
AM Daly, BJ Drouin, JC Pearson, K Sung, LR Brown, MAH Smith, Arlan Matz
Journal of Molecular Spectroscopy 316, 1-10
JC Pearson, AM Daly, RM Lees
Journal of Molecular Spectroscopy 318, 70-77 2016
Comprehensive Analysis of Prebiotic Propenal up to 660 GHz
AM Daly, C Bermúdez, L Kolesniková, JL Alonso The Astrophysical Journal Supplement Series 218 (2), 30 2015
Rotational spectroscopy of vibrationally excited N 2 H+ and N 2 D+ up to 2.7 THz
S Yu, JC Pearson, BJ Drouin, T Crawford, AM Daly, B Elliott, T Amano Journal of Molecular Spectroscopy (accepted)
Gas phase measurements of mono-fluoro-benzoic acids and the dimer of 3-fluoro-benzoic acid
AM Daly, SJ Carey, AM Pejlovas, K Li, L Kang, SG Kukolich Journal of chemical physics 142 (14), 144303 2015
Analysis of the rotational spectrum of the ground and first torsional excited states of monodeuterated ethane, CH 3CH2D
AM Daly, BJ Drouin, P Groner, S Yu, JC Pearson
Journal of Molecular Spectroscopy 307, 27-32 2015
The millimeter and submillimeter wave spectrum of cis-methyl vinyl ether
AM Daly, L Kolesniková, S Mata, JL Alonso Journal of Molecular Spectroscopy 306, 11-18 2014
Precision frequency measurement of N 2 O transitions near 4.5 μm and above 150 μm
WJ Ting, CH Chang, SE Chen, HC Chen, JT Shy, BJ Drouin, AM Daly Journal of the Optical Society of America B 31 (8), 1954-1963 2014
Laboratory characterization and astrophysical detection of vibrationally excited states of vinyl cyanide in Orion-KL
A López, B Tercero, Z Kisiel, AM Daly, C Bermúdez, H Calcutt, N Marcelino, S Viti, BJ Drouin, IR Medvedev, CF Neese, L Pszczółkowski, JL Alonso, J Cernicharo Astronomy & Astrophysics 572, A44 2014
Submillimeter measurements of the Criegee intermediate CH2 OO, in the gas phase
AM Daly, BJ Drouin, S Yu Journal of Molecular Spectroscopy 297, 16-20 2014