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Kang, Hani,Park, Youngwook,Kim, Zee Hwan,Kang, Heon American Chemical Society 2018 The Journal of physical chemistry A Vol.122 No.11
<P>The orientation state of hydrogen chloride (HCl) molecules in a solid argon matrix was reversibly controlled by applying an external electric field of up to 4 × 10<SUP>8</SUP> V·m<SUP>-1</SUP> using the ice film capacitor method. The rovibrational transitions of the field-oriented HCl were measured by reflection absorption infrared spectroscopy with p-polarized light. Upon application of the external field, free rotation of HCl inside the matrix gradually changed to perturbed rotation and then to a pendular state harmonically bound in the Stark potential well. Further increase in the field strength increased the degree of dipole alignment along the field direction, approaching an asymptotically perfect orientation of the molecules with an average tilt angle of <30° at a field strength above 1 × 10<SUP>8</SUP> V·m<SUP>-1</SUP>.</P> [FIG OMISSION]</BR>
Kang, Hani,Shin, Sunghwan,Park, Youngwook,Kang, Heon American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.31
<P>The effect of an external electric field. oil the C-O stretch frequency, v(C-O), of carbon monoxide was studied for CO in different environments of condensed molecular films: (I) chemisorbed CO on Pt(111) covered with amorphous solid water (ASW), (II) CO trapped in an ASW matrix, (III) chemisorbed CO on Pt(111) covered with solid Ar, and (IV) CO trapped in a solid Ar matrix. Changes in nu(C-O) of these samples under an electric field were measured to investigate the Stark frequency shift and the effect of metal-adsorbate charge transfer on the frequency change. The electric field was applied up to 4.3 x 10(8) V.m(-1) using the ice film capacitor method. Reflection absorption infrared spectroscopy was used to monitor the spectral changes of the nu(C-O) band. The Stark shift was measured from the nu(C-O) change of isolated CO in the ASW matrix:under the field. The effect of Metal-adsorbate charge transfer was estimated for chemisorbed CO by measuring the nu(C-O) shift under the field and subtracting the electrostatic Stark effect. The electrostatic Static effect appeared with a Stark tuning rate of Delta mu = 0.64 +/- 0.04 cm(-1)/(10(8) V-m(-1)) for CO in the ASW matrix. The charge transfer effect on the frequency change had a sensitivity factor of Delta(nu) over bar/sigma approximate to 200 cm(-1)/C.m(-2) for chemisorbed CO on Pt(111), where sigma is the excess charge density of the Pt surface. From these observations, we suggest that in electrochemical experiments, where nu(C-O) of CO adsorbates on the electrode surface changes with the electrode bias potential, the frequency shift may result predominantly from the metal-adsorbate charge transfer rather than the electrostatic Stark shift.</P>
Complete Genome Sequence of Marinomonas Bacteriophage P12026
Kang, Ilnam,Jang, Hani,Oh, Hyun-Myung,Cho, Jang-Cheon American Society for Microbiology 2012 Journal of virology Vol.86 No.16
<P>Members of the genusMarinomonasin theGammaproteobacteriaare broadly distributed in marine environments where they could be infected by bacteriophages. Here we report the genome sequence of bacteriophage P12026 that can lytically infect bacterial strain IMCC12026, a member of the genusMarinomonas. To our knowledge, this is the first genome sequence of a lytic bacteriophage infecting the genusMarinomonas.</P>
Shin, Sunghwan,Kang, Hani,Cho, Daeheum,Lee, Jin Yong,Kang, Heon American Chemical Society 2015 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.119 No.27
<P>We studied the Stark effect on the hydroxyl stretching vibration of water molecules in ice under the influence of an external electric field. Electric fields with strengths in the range from 6.4 × 10<SUP>7</SUP> to 2.3 × 10<SUP>8</SUP> V·m<SUP>–1</SUP> were applied to an ice sample using the ice film capacitor method. Reflection absorption infrared spectroscopy was used to monitor the field-induced spectral changes of vibrationally decoupled O–H and O–D bands of dilute HOD in D<SUB>2</SUB>O and H<SUB>2</SUB>O–ice, respectively. The spectral changes of the hydroxyl bands under applied field were analyzed using a model that simulates the absorption of a collection of Stark-shifted oscillators. The analysis shows that the Stark tuning rate of ν(O–D) is 6.4–12 cm<SUP>–1</SUP>/(MV·cm<SUP>–1</SUP>) at a field strength from 1.8 × 10<SUP>8</SUP> to 6.4 × 10<SUP>7</SUP> V·m<SUP>–1</SUP>, and the Stark tuning rate of ν(O–H) is 10–16 cm<SUP>–1</SUP>/(MV·cm<SUP>–1</SUP>) at a field strength from 2.3 × 10<SUP>8</SUP> to 9.2 × 10<SUP>7</SUP> V·m<SUP>–1</SUP>. These values are uniquely large compared to the Stark tuning rates of carbonyl or nitrile vibrations in other frozen molecular solids. Quantum mechanical calculations for the vibrations of isolated water and water clusters show that the vibrational Stark effect increases with the formation of intermolecular hydrogen bonds. This suggests that that the large Stark tuning rate of ice is due to its hydrogen-bonding network, which increases anharmonicity of the potential curve along the O–H bond and the ability to shift the electron density under applied electric field.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-27/acs.jpcc.5b01850/production/images/medium/jp-2015-018506_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5b01850'>ACS Electronic Supporting Info</A></P>
Shin, Sunghwan,Kang, Hani,Kim, Jun Soo,Kang, Heon American Chemical Society 2014 The Journal of physical chemistry B Vol.118 No.47
<P>We investigated the phase transformations of amorphous solid acetone under confined geometry by preparing acetone films trapped in amorphous solid water (ASW) or CCl<SUB>4</SUB>. Reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) were used to monitor the phase changes of the acetone sample with increasing temperature. An acetone film trapped in ASW shows an abrupt change in the RAIRS features of the acetone vibrational bands during heating from 80 to 100 K, which indicates the transformation of amorphous solid acetone to a molecularly aligned crystalline phase. Further heating of the sample to 140 K produces an isotropic solid phase, and eventually a fluid phase near 157 K, at which the acetone sample is probably trapped in a pressurized, superheated condition inside the ASW matrix. Inside a CCl<SUB>4</SUB> matrix, amorphous solid acetone crystallizes into a different, isotropic structure at ca. 90 K. We propose that the molecularly aligned crystalline phase formed in ASW is created by heterogeneous nucleation at the acetone–water interface, with resultant crystal growth, whereas the isotropic crystalline phase in CCl<SUB>4</SUB> is formed by homogeneous crystal growth starting from the bulk region of the acetone sample.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcbfk/2014/jpcbfk.2014.118.issue-47/jp503997t/production/images/medium/jp-2014-03997t_0007.gif'></P>