Rsc_cp_c0cp02435j 1..7

نویسندگان

  • Hiromichi Hoshina
  • Yusuke Morisawa
  • Harumi Sato
  • Hiroaki Minamide
  • Isao Noda
  • Yukihiro Ozaki
  • Chiko Otani
چکیده

Temperature-dependent terahertz (THz) absorption spectra of poly(3-hydroxyalkanoate)s (PHAs) were measured by using a Fourier transform far-infrared (FT-FIR) spectrometer and a THz time-domain spectrometer over a temperature range of 10 K to 465 K with a liquid helium cryostat and a heating cell. Clear differences were observed between the spectra of crystalline and amorphous polyhydroxybutyrate (PHB), indicating that the absorption peaks observed in the THz spectra originated in the higher-order conformation of PHB. The polarization spectra of a stretched PHB sample were measured, and the direction of the vibrational transition moment was determined. The temperature dependences of the spectra reveal frequency shifts and broadening of the absorption peaks with temperature, suggesting large anharmonicity of the vibrational potential. The temperature shift behaviour is quite different in each transition. Some of the transitions show a blue shift, which cannot be explained by a simple anharmonic potential model. Frequency shifts of the peaks were mainly observed below 10 THz, which suggests a large anharmonicity of the vibrational potential at lower frequencies.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Supplement to Internally 4-connected projective-planar graphs

A5 = {{1, 2}, {1, 3}, {1, 4}, {1, 5}, {2, 3}, {2, 4}, {2, 5}, {3, 4}, {3, 5}, {4, 5}, {6, 7}, {6, 8}, {6, 9}, {6, 10}, {7, 8}, {7, 9}, {7, 10}, {8, 9}, {8, 10}, {9, 10}} C11 = {{1, 2}, {1, 3}, {1, 4}, {1, 5}, {2, 3}, {2, 4}, {2, 5}, {3, 4}, {3, 5}, {4, 5}, {6, 9}, {6, 10}, {6, 11}, {7, 9}, {7, 10}, {7, 11}, {8, 9}, {8, 10}, {8, 11}} E42 = {{1, 4}, {1, 5}, {1, 6}, {2, 4}, {2, 5}, {2, 6}, {3, 4},...

متن کامل

Work supported in part by US Department of Energy contract DE-AC02-76SF00515

! " " # $$ $ " ! $$ ! # ! " ## !$ % & ' ( ) * + #, + $ * ./ / , 0 1 . 2 ) " ( '. & 3 # ( + , , % ! ( #/ " ## " + " ## +, 4 $ $ 2 4 5/. 2 % 5, $ ) 2 1 , 0 / . 2 0 . 2 $ 2 + / , 2 & ,. 2 " $ / % + .)/ .6 " " $. " # % # . ( #* 3 / 7 1 ! " # ! 8 , * * ! " ( ! % + 2 $ ./ % 4 ,* " ( , + ) ! 3 .* " # 5 , $. , ** 1 3 # * ( , ! % % $$ , % ( #$ 1 !* !. $. $ 7 # 4 . # 4 " % ) 2 " $$ " ' " % . $ 9 $ * 3 7 ...

متن کامل

Satellite-HAP Network Supporting Multilayered QoS Routing in the Sky

!"#$%&'#("%)*+",#-(#)!"#(*)*+"#$-.&/"#0-$$*'&0%1-'#,2,)"$,#%+"#)!"#3+-4&,&-'&'5#-(#!&5!6,3""7#7%)%#)+%',$&,,&-',# 8*3#)-#9#:.;,<#%'7#&')"+%014"#$*/1$"7&%#,"+4&0",=#>-+#"?"014"#7"/&4"+2#-(#)!","#,"+4&0",@#)!"#'")A-+B#$*,)#,%1,(2# ,-$"#,)+&0)#C*%/&)26-(6,"+4&0"#8D-E<#$")+&0,@#7"F'"7#)23&0%//2#&'#)"+$,#-(#$%G&$*$#7"/%2#%'7;-+#$&'&$*$#)!+-*5!3*)# 3"+(-+$%'0",= H00-+7&'5#)-#)!&,#5"'"+%/#4&,&-'@#)!"#...

متن کامل

Additional file 5.xlsx

position -4 C50 C49 C48 C47 C46 C45 C44 C43 C42 C41 C40 C39 C38 C37 C36 C35 C34 C33 C32 C31 C30 C29 C28 C27 C26 C25 C24 C23 C22 C21 C20 C19 C18 C17 C16 C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 C-index SD P-value mark A 5 7 9 1 8 4 6 2 1 4 8 7 6 9 3 4 3 7 15 10 6 6 9 3 2 5 3 6 8 9 6 3 5 7 7 10 4 7 7 8 5 5 8 2 2 3 1 2 5 5 9 0.618 0.317 8.27E-03 n.s. A C 3 1 2 0 2 3 3 1 1 2 1 7 4 9 1 ...

متن کامل

Computational Communities: A Marketplace for Federated Resources

! #"$ ! &%! ' ( )+*-,."$ & / ! 102 3 & /4 5 3 6* ,."$ 7& 8 ,. % /, 7 *-) 902 *% : 8 ; % ,.< % % =>, 4 "? % "? @, 0A % *3 5 !, ,1 3B. %C < % /,.7& *5 D @ .,E % @, 0F< , >7 / > /,.7 * 1 ,5BG ! -H I 4 /, 7 *& , BG ! ' * ,."$" 7 : J= < %! ,1 / -* 0C=$ *-*/ * ,. + / ,.%K , % !* ! L ,$ .,5BE M N7 / N, 0O @ /,.7& *-H@P@ % :4 *,. Q R #*-, "$" 7 : J=S 5 $ , 8 3 S T /02, "? * T< 3BG !, 7 8 % 0U, "? 5 !, ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2011