2D18ABCDEFG SFG HIJKLMNOPQ45R6STUVWX=;!
0YZ%[\Z 1]YZ%\Z #]YZ%\ ^3!
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ÂÃÄ?Å\6Æ+Ç»{ÈÉÊË¤zªÌm­Í(ÎIF°ÏÐ+,LMN45IÐÑ+]ÒÓ?;ÔÕÖÕ×Ø,ÙÚDEFGFHIJÉLMN45IµÛKSTUVWX=;× {»I+¤Ü,j1ÝÞlªßÊË(m{IeØ65(¦§·zK%&'IµÛKUVWX=;)*×]Gà6áâzã*,45(ä®­·×Ñå+]ABCDEFGæ³çèéêë0-ìÝ789:3Fíî6ïê×äð,ª­6íî×Ø¤ñòóIôN6FGõdÁzö÷6Á×ôxKøLM@ùÃjúl6OPQ450-./#011233RI%&'(ÏÐ+,F°6UVWX=;×¥6ûüýxK­·×þy,ª!
jeÿl!789: )*I §zé!"#'$%Ó?;01222!&'Ý1!Ý!
3èé4!522!6'7!80!12!&'Ý1]Ó?;0!^!9:];É<+TiO2(110) 1x1)

(222!&' 3m])*+6@ùÃÂ,-V./ë©01620'90!
(001Ý11=>?3»{Ó@A>BC=©0DEFèéêëIJÉG,ª­6$%Ó?;· 522!6' 6Ó?;×ÂÃÄ?RIHI+ 89×êëJ,j5lª­6ñHmKLÕM²ÃM,NO>C'$%P×Qð, 89: HI¢£¤R¨6ÎS(ºKªÍ,DEFG)*(mT¯·+¤ 522!6' 6UøVé (22!

(110)

0!

" 1$!?@? -./#0112345!

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jPbcdýl!" # Im 1222!&'Ý1Ý(222!&'Ý1 6ef6 789: ;<=>?×g+,ª­­Im÷h»6ÎSozAÕ=ü)¤K]Í| #ú22!&'Ý1Ý^ú22!&'Ý1 6efIÐÑxKª«ioz
jMdkl6OF°m;<=>?·6¢n»{ #ú22!&'Ý1Ý#o22!&'Ý1 6KLÕMzAÕ=m%&'(pÐ+,qzjMdk6 r>#7!r>^ stæ³(ºK·du{Kª«¬]v¡6ds56;<=>?Ç·6¢n»{ ^122!&'Ý1Ý^ú22!&'Ý1 6AÕ=mÏÐd6 /> stæ³·wKª­{6AÕ=møLM@ùÃRx6y%HIIJÉôN6FG]õdÁ¯­z%Ü÷#MxK­·{|Kª¥­(]y%}~!0#(6'3× 1 FEHI+]¥66;<=>?6D#M×)*+,0" ^3ª¥6Pb]y%HI(m r>#7!r>^ stæ³6AÕ=%Ü÷|]1Þ DE¸+,IHI6;<=>?
Ið¤,ª­môN6FGDEõdÁIJð¤¯­K#M·÷«+¤µÉ]Ø,þWIµ¤­{6ST¯­ð¤K­·×g+¤Kª­6J®z#MmøL
M@ùÃW°Iµ¤mx(Iü)¤surface water

CH, OH stretching
CH2CH3ice-likeOH
liquid-likeOH!

=>?#Mm ^2 F¨¸+¤·#¼{HOH bending

SF intensity (arb. unit)

+]/> st6AÕ=mR +,ªÍ,­6;<bulk water and hydrocarbons
1000

1500

2000
2500
3000
-1
IR wavenumber (cm )

3500

4000

" #$!%&'()*+, -./#01123456
789: ;<=>?!

Kjo712l]OPQ45RIµ¤ü)+,6m

TiO2(110) single crystal

ßÊËó¤(ºKª!
SF intensity (arb. unit)

before treatment
15min Hg lamp irradiation
30min elapsed
next day, 16hrs elapsed! I 1Þ22!&'Ý1 p}6AÕ=Ih¤dý+,ª']1^! 6(ä¼, >ì8 æ³F6Pbj11l(m]ÏÐdF°6#æ³45U ( 1Þ2!&'Ý1 I]¡ Ñ¢£6öF°CH2, CH3

ice-likewaterÏÐ( 1ÞÞ2!&'Ý1 Iü)¤Kª­mU
6dF°45·JÉ\¤´Ø×+]¡hydrocarbons

Ñ

2800

¢£6dF°·m·dkP¥×+¤z

3000

6dF°%&'

3200

HO
3400

3600

3800

-1

IR wavenumber (cm ),ó(ºKª 789: IJÉ)*,AÕ=m
1Þ22!&'Ý1 IºK,ó45U 1

liquid-likewater" ^$y%HIIJK;<=>?#M!

(ó¤ü),·du{KªÍ, -./#0112345m5h¬Á×¦h­·»{­6AÕ=65h¬Á×)*+,·­§02213DE01Ý123¬¨I©+¤ª ( ¨6¬¨(«÷zK­·¬ +,0" (3ª­mU dF°÷­¨+¤K­·×g+¤Kªe®IU«¯\°±Iµ¤ÏÐdF°mdk¯°×øLM@ùÃ6Lk²6¬I¨Û¤K³´p*·¤µÉjÞl]6Pb·µ¶+zª,·+]$%6y6¸¹(m­65h¬ÁOF°Iº¼{| 89: »¼m½ ¾zª¥­(çèé6é!·¿ÀÁ+6 8>: ;<=>?
0Þo2!6'Ýú(2!6'3×)*+,·­§KLÕMz{¸¹·5h¬Áü),ª­6¸¹
0~1$úÂ736¯Pm]ÃÄ?ÅÕ²ÃMÅÆCÄ0^$1!Â73I¢£¤»zÉÇ­·»{ÈÉÊ[·du{KªÍ,5h¬ÁºK­·»{dF°·45ÈÉÊ[·6½¥oz(110)0°³´ºK­·{|Kªxz¼ËÈ

SF intensitysin"

1530!

ÉÊ[IJK 89: ©ÌbOF°dF°ü),¯Í··Î¼Kª!

6075!

! {I]y%HIIµÛKeDE6U

90 (001)
105

VWX=;× {»IxK,óI](226' 61 ns
recovery time120

T¯×Ø]­6AÕ=6DEFG)*×
äð,0" (3ª¥6Pb]AÕ=mT¯

SF intensity (arb. unit)

45

135
150
180

165(a)

pump: 400 nm-1
probe: 1600 cm(b)
-200

0200
delay (ps)

400

600

I%Ü÷+]¥6WC»Û¤ÏIK­·¬ +,ªÍ,¸Ð;<=>?
6)*(mAÕ=Ñ,>mü)z»ð" ($!1Þ22!&'Ý1 AÕ=65h¬Á03· (22!6'T¯6¨#M6DEÄL,-V?03!

,ª­6­·»{­6m5h­¨+,dF°45IÒ,°ÓmÔÕIJð¤¥6­¨×Ö,6·du{]¥6×IW¹¨6DE

§(ºK­·×g+¤KªÒwm{IøLM@ùÃ6Ø65DEØ6LMN45IµÛK 789: )*DEDEFG)*IÙÉ
Ú(Kª!
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